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3. Relationship between hexokinase and the aquaporin PIP1 in the regulation of photosynthesis and plant growth.

Author

Kelly, Gilor, Sade, Nir, Attia, Ziv, Secchi, Francesca, Zwieniecki, Maciej, Holbrook, N, Levi, Asher, Alchanatis, Victor, Moshelion, Menachem, and Granot, David

Subjects
Aquaporins, Arabidopsis, Arabidopsis Proteins, Biological Transport, Hexokinase, Lycopersicon esculentum, Photosynthesis, Plant Development, Plant Leaves, Plant Roots, Plant Stems, Plant Transpiration, Plants, Genetically Modified, Tobacco, Water
Abstract

Increased expression of the aquaporin NtAQP1, which is known to function as a plasmalemma channel for CO₂ and water, increases the rate of both photosynthesis and transpiration. In contrast, increased expression of Arabidopsis hexokinase1 (AtHXK1), a dual-function enzyme that mediates sugar sensing, decreases the expression of photosynthetic genes and the rate of transpiration and inhibits growth. Here, we show that AtHXK1 also decreases root and stem hydraulic conductivity and leaf mesophyll CO₂ conductance (g(m)). Due to their opposite effects on plant development and physiology, we examined the relationship between NtAQP1 and AtHXK1 at the whole-plant level using transgenic tomato plants expressing both genes simultaneously. NtAQP1 significantly improved growth and increased the transpiration rates of AtHXK1-expressing plants. Reciprocal grafting experiments indicated that this complementation occurs when both genes are expressed simultaneously in the shoot. Yet, NtAQP1 had only a marginal effect on the hydraulic conductivity of the double-transgenic plants, suggesting that the complementary effect of NtAQP1 is unrelated to shoot water transport. Rather, NtAQP1 significantly increased leaf mesophyll CO₂ conductance and enhanced the rate of photosynthesis, suggesting that NtAQP1 facilitated the growth of the double-transgenic plants by enhancing mesophyll conductance of CO₂.

Published
2014

4. THE CONTRIBUTION OF INDICES REFLECTING SCHOLASTIC AND EMOTIONAL INTELLIGENCE TO THE EXPLANATION OF THE DIFFERENCES IN THE ACHIEVEMENTS OF SPECIAL EDUCATION STUDENTS / תרומתם של מדדים המשקפים אינטליגנציה סכולסטית ואינטליגנציה רגשית להסבר ההישגים האקדמיים של סטודנטים לחינוך מיוחד

Author

גרנות, דודי, גור, טלי, פסטור, רונית, GRANOT, DAVID, GUR, TALYA, and PASTOR, RONIT

Published
2018

5. Insecure Attachment Representations and Profiles of Problematic Adjustment to School in Middle Childhood.

Author

Granot, David and Mayseless, Ofra

Abstract

Although there is considerable evidence linking the security of children's attachment to their mothers to child competence and adaptive functioning, the distinct picture of adjustment problems characteristic of each pattern of insecure attachment has received less research attention, especially during middle childhood. This study examined the concurrent associations between the child's representation of the mother-child attachment relationship and adaptive functioning in the school during middle childhood. Participating were 113 fourth and fifth graders; subjects were given the Doll Story completion task, which had been modified for their use. Based on this measure, children were classified as secure, avoidant, ambivalent, or disorganized with regard to attachment representation. Teachers assessed each child's academic achievement, emotional and social adjustment, and frequency of behavior problems. Each participating class underwent a sociometric procedure. The findings indicated that secure children showed better adjustment to school as reflected in teachers' reports of scholastic, emotional, social, and behavioral adjustment, as well as in peer-rated social status. Discriminant analyses allowed identification of distinct profiles of problems for each insecure attachment representation prototype. Almost 94 percent of the subjects were correctly classified into their attachment representation prototype. (KB)

Published
1999

8. Plant Response to Drought Stress

Author

David-Schwartz, Rakefet, primary, Stein, Hanan, additional, Raveh, Eran, additional, Granot, David, additional, Carmi, Nir, additional, and Klein, Tamir, additional

Published
2019
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9. Socioemotional and Behavioural Adaptation of Students with Disabilities: The Significance of Teacher-Student Attachment-Like Relationships

Author

Granot, David

Abstract

The present study explores the extent to which maternal attachment and teacher--student attachment-like relationships explain the socioemotional adaptation of students with disabilities. Participants consisted of 65 dyads of homeroom teachers and their students (from a middle-to-low-class area in Northern Israel) with learning disabilities (LD), attention deficit hyperactivity disorder (ADHD), and LD/ADHD-co-morbidity (mean age = 10.9). Students were assessed based on the maternal attachment security scale (ASS) and the appraisal of the teacher as a secure base scale. Homeroom teachers completed the student-teacher security scale. Third-party teachers reported on students' school adaptation. Results indicated that beyond the disability factor, secure teacher-student relationships reduced the students' externalising problem behaviours and improved student learning proficiencies that are considered to be affected by the adequacy of executive functioning. Additionally, maternal attachment reduced internalising problem behaviours. Implications for the protective role of teachers of students with disabilities and for research on teacher--student relationship quality are discussed.

Published
2016
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13. Guard cell activity of PIF4 and HY5 control transpiration

Author

Kelly, Gilor, primary, Yaaran, Adi, additional, Gal, Atara, additional, Egbaria, Aiman, additional, Brandsma, Danja, additional, Belausov, Eduard, additional, Wolf, Dalia, additional, David-Schwartz, Rakefet, additional, Granot, David, additional, Eyal, Yoram, additional, Carmi, Nir, additional, and Sade, Nir, additional

Published
2023
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18. Representations of Mother-Child Attachment Relationships and Social-Information Processing of Peer Relationships in Early Adolescence

Author

Granot, David and Mayseless, Ofra

Abstract

We examined the concurrent associations between early adolescents' representations of mother-child attachment relationships and how they process social information in their peer relationships. Attachment representations were examined in a normative sample of 97 males and 88 females (mean age = 10.35 years), using an adaptation of the Attachment Doll Story Completion Task. Structural Equation Modeling was used to assess general latent structures of social-information processing (SIP) orientations across the different SIP steps. As expected, secure mother-child attachment representations were positively associated with prosocial SIP orientation and negatively with antisocial SIP orientation. Avoidant attachment was associated negatively with prosocial and distress expression SIP orientations. Ambivalent attachment was positively associated with distress expression SIP orientation. Disorganized attachment was positively associated with SIP distress expression orientation and with antisocial SIP orientation. Results are discussed as reflecting a generalization of social knowledge and regulation strategies from the attachment system to the affiliative system. (Contains 4 figures and 1 table.)

Published
2012
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19. Guard-cell-targeted overexpression of Arabidopsis Hexokinase 1 can improve water use efficiency in field-grown tobacco plants

Author

Acevedo-Siaca, Liana G, Głowacka, Katarzyna, Driever, Steven M, Salesse-Smith, Coralie E, Lugassi, Nitsan, Granot, David, Long, Stephen P, Kromdijk, Johannes, Acevedo-Siaca, Liana G, Głowacka, Katarzyna, Driever, Steven M, Salesse-Smith, Coralie E, Lugassi, Nitsan, Granot, David, Long, Stephen P, and Kromdijk, Johannes

Abstract

Water deficit currently acts as one of the largest limiting factors for agricultural productivity worldwide. Additionally, limitation by water scarcity is projected to continue in the future with the further onset of effects of global climate change. As a result, it is critical to develop or breed for crops that have increased water use efficiency and that are more capable of coping with water scarce conditions. However, increased intrinsic water use efficiency (iWUE) typically brings a trade-off with CO2 assimilation as all gas exchange is mediated by stomata, through which CO2 enters the leaf while water vapor exits. Previously, promising results were shown using guard-cell-targeted overexpression of hexokinase to increase iWUE without incurring a penalty in photosynthetic rates or biomass production. Here, two homozygous transgenic tobacco (Nicotiana tabacum) lines expressing Arabidopsis Hexokinase 1 (AtHXK1) constitutively (35SHXK2 and 35SHXK5) and a line that had guard-cell-targeted overexpression of AtHXK1 (GCHXK2) were evaluated relative to wild type for traits related to photosynthesis and yield. In this study, iWUE was significantly higher in GCHXK2 compared with wild type without negatively impacting CO2 assimilation, although results were dependent upon leaf age and proximity of precipitation event to gas exchange measurement.

Published
2022

20. Guard-cell-targeted overexpression of Arabidopsis Hexokinase 1 can improve water use efficiency in field-grown tobacco plants

Author

Acevedo-Siaca, Liana G., Głowacka, Katarzyna, Driever, Steven M., Salesse-Smith, Coralie E., Lugassi, Nitsan, Granot, David, Long, Stephen P., Kromdijk, Johannes, Acevedo-Siaca, Liana G., Głowacka, Katarzyna, Driever, Steven M., Salesse-Smith, Coralie E., Lugassi, Nitsan, Granot, David, Long, Stephen P., and Kromdijk, Johannes

Abstract

Water deficit currently acts as one of the largest limiting factors for agricultural productivity worldwide. Additionally, limitation by water scarcity is projected to continue in the future with the further onset of effects of global climate change. As a result, it is critical to develop or breed for crops that have increased water use efficiency and that are more capable of coping with water scarce conditions. However, increased intrinsic water use efficiency (iWUE) typically brings a trade-off with CO2 assimilation as all gas exchange is mediated by stomata, through which CO2 enters the leaf while water vapor exits. Previously, promising results were shown using guard-cell-targeted overexpression of hexokinase to increase iWUE without incurring a penalty in photosynthetic rates or biomass production. Here, two homozygous transgenic tobacco (Nicotiana tabacum) lines expressing Arabidopsis Hexokinase 1 (AtHXK1) constitutively (35SHXK2 and 35SHXK5) and a line that had guard-cell-targeted overexpression of AtHXK1 (GCHXK2) were evaluated relative to wild type for traits related to photosynthesis and yield. In this study, iWUE was significantly higher in GCHXK2 compared with wild type without negatively impacting CO2 assimilation, although results were dependent upon leaf age and proximity of precipitation event to gas exchange measurement.

Published
2022

33. Metabolism of soluble sugars in developing melon fruit: a global transcriptional view of the metabolic transition to sucrose accumulation

Author

Dai, Nir, Cohen, Shahar, Portnoy, Vitaly, Tzuri, Galil, Harel-Beja, Rotem, Pompan-Lotan, Maya, Carmi, Nir, Zhang, Genfa, Diber, Alex, Pollock, Sarah, Karchi, Hagai, Yeselson, Yelena, Petreikov, Marina, Shen, Shmuel, Sahar, Uzi, Hovav, Ran, Lewinsohn, Efraim, Tadmor, Yakov, Granot, David, Ophir, Ron, Sherman, Amir, Fei, Zhangjun, Giovannoni, Jim, Burger, Yosef, Katzir, Nurit, and Schaffer, Arthur A.

Published
2011
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