Elongation ability and non-structural carbohydrate levels in relation to submergence tolerance in rice
Elongation ability and non-structural carbohydrate levels in relation to submergence tolerance in rice
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DOI：
10.1016/j.plantsci.2004.07.023
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发表时间：
2005-01-01
期刊：
影响因子：
5.2
通讯作者：
Ismail, AM
中科院分区：
文献类型：
--
作者：
Das, KK;Sarkar, RK;Ismail, AM
暴洪对南亚和东南亚广大低洼地区的水稻生产力产生不利影响。耐受基因型进行了鉴定，并发现关键性状，如高水平的非结构性碳水化合物（NSC，淀粉和可溶性糖）和有限的水下伸长率与耐受性。在这项研究中，我们评估的作用，NSC之前和之后的淹没和淹没期间的芽伸长在淹没耐受性的基因型，在初始NSC含量和淹没期间的伸长能力的对比。使用生长促进剂GA（3）和有效的赤霉素合成抑制剂多效唑（PB）进一步操纵这些性状。浸泡10天导致IR42（不耐受）的死亡率较高，其次是Sabita和Hatipanjari。后两个品种具有类似于耐受品种FR 13A的高初始NSC，但在水下延伸到更高的程度。外源GA（3）促进了NSC在水下的伸长和耗竭，降低了存活率。相反，PB抑制延伸，改善NSC的保留和提高存活率。FR13A对PB的响应较低，但对GA的响应更高，表明其在淹没下固有的低GA浓度。水下伸长与淹没过程中消耗的NSC有关，但与淹没前的NSC水平无关。淹水后幼苗存活率与NSC的相关性（r（2）= 0.74）强于淹水前（r（2）= 0.27）。这表明，淹没后维持的碳水化合物，是初始水平和淹没期间使用的水平的结果，对生存更重要。(C)2004爱思唯尔爱尔兰有限公司保留所有权利。
Flash flooding adversely affects rice productivity in vast areas of rainfed lowlands in South and Southeast Asia. Tolerant genotypes were identified and key traits such as high levels of non-structural carbohydrates (NSC, starch and soluble sugars) and limited underwater elongation were found to be associated with tolerance. In this study, we evaluated the role of NSC before and after submergence and shoot elongation during submergence in submergence tolerance using genotypes that contrast in initial NSC content and elongation ability during submergence. The traits were further manipulated using a growth promoter, GA(3), and a potent gibberellin synthesis inhibitor, paclobutrazol (PB). Submergence for 10 days resulted in higher mortality of IR42 (intolerant), followed by Sabita and Hatipanjari. The latter two cultivars have a high initial NSC similar to that of the tolerant cultivar, FR13A, but elongated to higher extent under water. Exogenous GA(3) enhanced underwater elongation and depletion of NSC and reduced survival. Conversely, PB suppressed elongation, improved the retention of NSC and enhanced survival. FR13A is less responsive to PB but more responsive to GA, suggesting its inherently low GA concentration under submergence. Underwater elongation is associated with NSC consumed during submergence but not with NSC level before submergence. Seedling survival showed a stronger association with NSC maintained after submergence (r(2) = 0.74) than with NSC before submergence (r(2) = 0.27). This suggests that carbohydrates maintained after submergence, being the result of both initial level, and the level used during submergence, is more important for survival. (C) 2004 Elsevier Ireland Ltd. All rights reserved.