Field evaluation on functional roles of root plastic responses on dry matter production and grain yield of rice under cycles of transient soil moisture stresses using chromosome segment substitution lines
Field evaluation on functional roles of root plastic responses on dry matter production and grain yield of rice under cycles of transient soil moisture stresses using chromosome segment substitution lines
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DOI：
10.1007/s11104-012-1178-7
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发表时间：
2012-03
期刊：
影响因子：
4.9
通讯作者：
J. Niones;R. Suralta;Y. Inukai;A. Yamauchi
中科院分区：
文献类型：
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作者：
J. Niones;R. Suralta;Y. Inukai;A. Yamauchi
研究背景水稻田因水旱灾害的反复发生而引起的土壤水分波动，严重影响水稻的生长发育和产量。本研究以水稻品种CSSL47和轮回亲本日本晴为材料，在土壤水分胁迫条件下，研究了根系可塑性发育对产量的影响。结果在连续涝渍条件下，两种基因型在多数性状上差异不显著。而在连续水旱交替条件下，CSSL47的地上部干物质生产量高于日本晴，这主要是由于其较高的气孔导度和光合速率，进而导致了较高的籽粒产量。CSSL47的根系发育以总根长表示，比日本晴大。在抽穗期之前，可塑性表现为基于根孔隙度的通气组织形成增强，这与促进侧根产生、伸长和分枝以及最终增加总根长有关。此外，抽穗后，与日本晴相比，CSSL47继续产生更多的节根从新产生的分蘖，从而维持叶片光合作用，最终导致较重的panicle.ConclusionsWe提供的证据表明，根可塑性，这更好地表达在CSSL47比日本晴，在连续循环的瞬时土壤水分胁迫下，有助于增加粮食产量的领域。根系塑性响应的遗传变异可能对经历这种土壤水分胁迫的地区的产量产生重大影响。
BackgroundFluctuating soil moisture resulting from the transient occurrences of waterlogging and drought are frequently reoccurring in the rice field, which adversely affects plant growth and yield. We previously established the significant contribution of plastic development and associated physiological responses of root to shoot dry matter production under soil moisture fluctuation stresses.AimTo evaluated the functional roles of root plastic development on yield under field condition of continuous cycle of transient soil moisture stresses.MethodsPreviously selected CSSL47 and the recurrent parent Nipponbare were exposed to two soil moisture conditions; cycles of alternating waterlogging and drought condition (CAW-D) and continuous waterlogging (CWL; control).ResultsUnder continuous waterlogging (CWL) conditions, the two genotypes showed no significant differences in most of the traits examined. In contrast, under continuous cycle of alternate waterlogging and drought (CAW-D) conditions, CSSL47 showed greater shoot dry matter production than Nipponbare, which was attributed to its higher stomatal conductance and photosynthetic rate, which then led to higher grain yield. The root system development of CSSL47 expressed as total root length was greater compared with Nipponbare. Before heading stage, plasticity was expressed as enhanced aerenchyma formation based on root porosity, which was associated with the promotion of lateral root production, elongation and branching and the eventual increase in total root length. Moreover, after heading, compared with Nipponbare, CSSL47 continued to produce more nodal roots from newly produced tillers, thus maintaining leaf photosynthesis and eventually resulting in heavier panicles.ConclusionsWe provide evidences that root plasticity, which better expressed in CSSL47 than Nipponbare, under continuous cycle of transient soil moisture stresses contributed to increase in grain yield in fields. Genetic variation in plastic responses of roots could have substantial impact on yield in areas experiencing these kind of soil moisture stresses.