Search

C16H20MnN10O8, monoclinic, P21/c (no. 14), a = 11.1178(7) Å, b = 12.7838(6) Å, c = 15.6649(10) Å, β = 105.692(6)°, V = 2143.4(2) Å3, Z = 4, Rgt(F) = 0.0638, ωRref(F2) = 0.2034, T = 293 K.

C6H11N3O3, monoclinic, P21/n (no. 14), a = 6.1802(3) Å, b = 12.6623(5) Å, c = 10.0897(4) Å, β = 93.328(2)°, V = 760.10(6) Å3, Z = 4, Rgt(F) = 0.0341, wRref(F2) = 0.0864, T = 150 K.

Crown removal revitalises sand‐fixing shrubs that show declining vigour with age in drought‐prone environments; however, the underlying mechanisms are poorly understood. Here, we addressed this knowledge gap by comparing the growth performance, xylem hydraulics and plant carbon economy across different plant ages (10, 21 and 33 years) and treatments (control and crown removal) using a representative sand‐fixing shrub (Caragana microphylla Lam.) in northern China. We found that growth decline with plant age was accompanied by simultaneous decreases in soil moisture, plant hydraulic efficiency and photosynthetic capacity, suggesting that these interconnected changes in plant water relations and carbon economy were responsible for this decline. Following crown removal, quick resprouting, involving remobilisation of root nonstructural carbohydrate reserves, contributed to the reconstruction of an efficient hydraulic system and improved plant carbon status, but this became less effective in older shrubs. These age‐dependent effects of carbon economy and hydraulics on plant growth vigour provide a mechanistic explanation for the age‐related decline and revitalisation of sand‐fixing shrubs. This understanding is crucial for the development of suitable management strategies for shrub plantations constructed with species having the resprouting ability and contributes to the sustainability of ecological restoration projects in water‐limited sandy lands. Summary statement: Embolism accumulation restricted carbon assimilation in aging shrubs and resulted in growth decline, while the crown‐removal treatment revitalised plants by promoting the construction of new hydraulic systems in resprouts and enhancing carbon balance through the removal of dysfunctional old stems. [ABSTRACT FROM AUTHOR]

Potato cultivars are not tolerant to low temperatures and frost, which directly affects the growth and development of plants and tubers, thus affecting potato yield. Wild potato species, such as S. boliviense, have abundant resources for cold frost resistance, which are important resources for improving cultivated potato varieties. Based on cold resistance identification of different S. boliviense strains, we screened and obtained the excellent strain BLV29-2 (S. boliviense) with comprehensive traits. It was then crossed and backcrossed with the diploid cultivar ED25, resulting in interspecific hybrids with stronger cold resistance. Inter-specific hybrid strains that had shown significant improvement in cold tolerance were treated with recycled colchicine. Cold tolerance and agronomic traits were assessed in some of the strains, and the results showed that all the doubled materials had significant increases in plant height, pollen grain diameter, and individual potato weight. Most of the materials showed there was no significant change in cold tolerance before and after doubling, but significantly improved compared to the cultivated species control. By crossing the treated strain T-FT073-4-7 with the superior tetraploid cultivar Huashu 13, we observed segregation of cold resistance in the offspring, with the 47% of the materials showing a preference towards the maternal parent T-FT073-4-7 and significantly higher cold resistance compared to the paternal cultivar. Through further field evaluations of agronomic traits, we identified selected breeding materials with the improved overall traits and the significantly enhanced cold resistance. This study successfully introduced the excellent cold resistance of the diploid wild species S. boliviense into the tetraploid cultivar, thus addressing the deficiency of the existing cultivar in terms of low-temperature sensitivity. These findings provide an important foundation for the selection and further improvement of cold-resistant genetic breeding materials. [ABSTRACT FROM AUTHOR]

A novel 1D Mn(II) coordination polymer, namely, [Mn3(bpz)2(MeCN)2Cl6]n (1) was synthesized by a solvothermal method based on bpz and MnCl2, where bpz is di(1H-pyrazol-1-yl)methane. The X-ray diffraction data show that the crystal structure of complex 1 is a one-dimensional polymer with two different coordination modes of the Mn(II) ions. The structure was modelled with Density Functional Theory (DFT) calculations and the intermolecular interactions were analyzed using the Hirshfeld surface method. [ABSTRACT FROM AUTHOR]