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Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

【Objective】 Field experiment was carried out to study the effect of different fertilizers on the mechanical strength of tobacco leaves,and the potential mechanism. 【Method】 Using Yunyan 87 as the experimental material in this paper, the data were analyzed by variance analysis, significance test and other methods. 【Result】 The mechanical strength and the lignin content in the main vein of sand leaf,4-6 ~(th) leaf and lumbar leaf increased significantly,and the rate of the fracture decreased, when Nicotiana tabacum cv. Yunyan87 was treated with potassium sulfate, borax, water-soluble organic potassium, water-soluble organic potassium + spraying bacterial manure of containing trace elements and bacterial manure of containing trace elements. The lignin content of main leaf vein, the activity of lignin synthesis related enzymes peroxidase(POD) and phenylalanine ammonialyase(PAL) in leaves resistant to fracture were higher than that of easily fractured leaves. The maximum mechanical supporting weight of tobacco leaf was closely related to the lignin content of the main leaf vein. Characteristics of anatomical structure suggested that the vascular bundle thickness was thick in main leave vein of tobacco leaves resistant to fracture,and fertilizers treatments could increase thickness of vascular bundle layer. 【Conclusion】 The activity of POD and PAL in mesophyll tissue, the lignin content in the main vein,mechanical strength of stalk in tobacco leaves increased significantly, and the rate of the fracture in tobacco leaves decreased effectively treated with above fertilizers. [ABSTRACT FROM AUTHOR]

The cold resistances of 18 banana germplasms seedling were studied by changes of physiological and morphological indices under low temperature treatment. The result showed that overlap was found in the cold-resistance relevant information provided by individual physiological indices, so it could not be used to evaluate the cold resistance of banana germplasms directly and accurately. 3 comprehensive indices were extracted from the eight individual physiological indices by principal component analysis, which was used for evaluate the cold resistance of eighteen banana germplasms. And the cold resistance evaluation of 18 bananas was done by these comprehensive indices. They declined in sequence from LT, Fenza, Jinfen 1, Guangdongfenjiao, SNT, LNS, Guijiaoqing 7, HLT, LE, SNY, LNF, HA, NLF, HR, Guijiao6, SDW, ZNF, to HLE. ?Vlso, these germplasms could be classified into three groups by hierarchical cluster analysis. The first group, included LT, Fenza and Jinfen 1, showed the highest cold resistance, the third group contained HLE, SDW, Guijiao 6 and ZNF with the minimum effects. The rest germplasms were clustered into the second group, which revealed medium cold resistance. The result was similar to the morphological evaluation. [ABSTRACT FROM AUTHOR]

The Leaf transection structure of different cold resistance banana have been studied by using paraffin section technology to offer for breeding of cold resistance of banana. The result showed the banana leaf belonged to typical bifacial leaf with a compound epidermis. Thickness of spongy tissue was the most variable in different bananas，followed by palisade tissue and spongy tissue ratio. Leaf tissue structure indexes were screened by correlation and hierarchical cluster analysis，spongy tissue thickness and palisade tissue and spongy tissue ratio were selected as the anatomy structure indexes to evaluate the cold resistance of banana. Then the cold resistance evaluation of 18 bananas was done by subordinate function，they declined in sequence from LT， Fenza，Jinfen 1 ， Guangdongfenjiao，H A ，LE， LNF，SNY， SNT，NLF，H R ，Guijiaoqing 7 ，HLT，LNS，SDW，Guijiao 6 ，ZNF，to HLE. Also，these germplasms could be classified into three groups by hierarchical cluster analysis. The cold-resistance of LT，Fenza and Jinfen 1were higher than others. [ABSTRACT FROM AUTHOR]

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Genetic diversity of 65 distinctive banana germplasm resources in Guangxi Zhuang Autonomous Region were stiadied by using ISSR markerr in research. The results showed that 35 ISSR primers were screened, and 13 primers with clear band, more band number and good repeatability were selected. The 13 primers amplified 96 bands, out of which 91 bands were polymorphic, and the percentage of polymorphic loci was 93. 69 %. Genetic similarity coefficient of 65 banana germplasm resources changed from 0. 479167 to 1. 000000, with an average of 0. 804726. Cluster analysis results indicated that ABB genotypes could be separated clearly from other genotypes at 0. 71 similarity level, and the plantain could be separated from dwarf bananas at 0. 74. Then the plantain germplasm resources could be classified into three groups at 0. 76 similarity level while dwarf bananas be four groups at 0. 92. [ABSTRACT FROM AUTHOR]

To provide a reference for reasonable use of black soil resources in future, the micromorphological characters of 4 land-use type black soil in Heilongjiang province were studied. The results showed that: (i) The primary mineral components of black soil coarse particles were quartz and feldspar，with some containing mica. Accelerated soil erosion induce by human farming activities，small particles were lost， which cause the soil coarse particles features ( area，perimeter，eudiometer，length，width) of surface layer larger. (ii) The porosity of nat­ural meadow land was small and almost lilce pipeline. The porosity of cultivated soil，abandoned field and artificial poplar forest land was lar­ger ，and its shape was irregular and piled up. Soil porosity increased when farmland was converted to forest or uncultivated，and void struc­ture became better. (iii)The soil pedofeature was mainly clay mineral，and some flocculent and porphyritic Fe-Mn minerals existed in B and C layers. The organic matter was plant residues (mostly plant roots)，humus and earthworm excretion in A layer，some humic flocculent pos­set and particles in B layer，and no organic matter in C layer. (iv) Enaulic fabric was found in Aand B layer of black soils influenced by human farming activities. C layer and natural meadow land had chitonic fabric. The micro structure of black soil was like spongy. [ABSTRACT FROM AUTHOR]