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首页> 外文期刊>Plant Science: An International Journal of Experimental Plant Biology >Waterlogging during flowering and boll forming stages affects sucrose metabolism in the leaves subtending the cotton boll and its relationship with boll weight
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Waterlogging during flowering and boll forming stages affects sucrose metabolism in the leaves subtending the cotton boll and its relationship with boll weight

机译：开花期和结铃期的涝渍影响棉铃对叶片中蔗糖的代谢及其与铃重的关系

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摘要

The work explored sucrose metabolism in the leaves subtending the cotton boll (SBL) and its role in boll weight after waterlogging in cotton. Results showed that net photosynthesis rate (Pn), relative water content, contents of Chlorophyll a and Chlorophyll b, initial ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco) activity and cytosolic fructose-1, 6-bisphosphatase (cy-FBPase) activity decreased with waterlogging in the SBL on fruiting branches 2-3 (FB2-3) and FB6-7. Activities of sucrose synthase (SuSy) and sucrose phosphate synthase (SPS) increased to the maximum up to 6 days of waterlogging then decreased with prolonged waterlogging. Rubisco activation and specific leaf weight increased and gene expressions of SuSy, SPS and rubisco activase (RCA) were all up-regulated with the duration of waterlogging, especially for the SBL on FB6-7. The induction of activity and gene expression of SuSy was most significant indicating its crucial role in sucrose metabolism after waterlogging. For the SBL in the later period of boll development on upper FB10-11 and FB14-16, the pattern seemed opposite to that of FB2-3 and FB6c7 as compensation effect in vegetative growth existed. Correlation analysis revealed that initial Rubisco activity and cy-FBPase activity were the main limitation to Pn reduction after waterlogging. Reduction in Pn, sucrose transformation rate and initial Rubisco activity directly decrease boll weight in waterlogged cotton. Besides the role in sucrose metabolism after waterlogging, SuSy also had a positive significant correlation with the duration of rapid-accumulation period for seed fiber weight (P<0.05). These findings elucidated mechanisms to waterlogging that affected seed fiber weight, which resulted from alteration in carbohydrates, enzymes and genes
机译：这项工作探索了棉铃（SBL）内的叶片中的蔗糖代谢及其在棉花浸水后铃铃重量中的作用。结果表明，净光合速率（Pn），相对含水量，叶绿素a和叶绿素b的含量，初始核糖-1,5-双磷酸羧化酶加氧酶（Rubisco）活性和胞质果糖-1、6-双磷酸酶（cy-FBPase） ）活性随SBL上果枝2-3（FB2-3）和FB6-7上的涝渍而降低。蔗糖合成酶（SuSy）和蔗糖磷酸合成酶（SPS）的活性在长达6天的涝渍时期增加到最大值，然后随着长时间的涝渍而降低。 Rubisco的活化和比叶重的增加以及SuSy，SPS和rubisco活化酶（RCA）的基因表达均随浸水持续时间而上调，尤其是FB6-7上的SBL。 SuSy的活性和基因表达的诱导是最重要的，表明其在淹水后在蔗糖代谢中起关键作用。对于上部FB10-11和FB14-16上铃发育后期的SBL，由于存在对营养生长的补偿效应，该模式似乎与FB2-3和FB6c7相反。相关分析表明，初始Rubisco活性和cy-FBPase活性是淹水后Pn还原的主要限制。降低Pn，蔗糖转化率和Rubisco初始活性直接降低了涝渍棉的铃重。 SuSy除了在渍水后促进蔗糖代谢中发挥作用外，还与种子纤维重量快速积累期的持续时间呈正相关（P <0.05）。这些发现阐明了淹水影响种子纤维重量的机制，这是由于碳水化合物，酶和基因的改变而引起的。

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