Carbohydrates Accumulation and Remobilization in Wheat Plants as Influenced by Combined Waterlogging and Shading Stress During Grain Filling
Carbohydrates Accumulation and Remobilization in Wheat Plants as Influenced by Combined Waterlogging and Shading Stress During Grain Filling
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灌浆期间涝渍和遮荫胁迫联合影响小麦植株碳水化合物的积累和再利用
DOI：
10.1111/j.1439-037x.2012.00532.x
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发表时间：
2013-02-01
影响因子：
3.5
通讯作者：
Cao, W.
中科院分区：
文献类型：
--
作者：
Li, H.;Cai, J.;Cao, W.
以小麦为试材，分别于花后07、815、1623和2431天进行淹水和遮荫复合胁迫处理。与非胁迫植株相比，WS显著降低了最终籽粒产量。花后7天施用WS显著降低了籽粒数，但几乎不受其他WS处理的影响;而千粒重不受花后7天施用WS的影响，但受其他WS处理的影响。花后07和815天施加的WS降低了茎中光合产物的积累，但后期施加的WS不影响茎中光合产物的积累。灌浆速率下降，但水分胁迫促进了碳水化合物从茎向籽粒的明显再调动。下部茎节中的碳水化合物储备比上部茎节中的碳水化合物储备更早被激活，再调动程度更大;但各处理下不同茎节间的表观再调动储备比例基本一致。WS降低了茎中果聚糖、果糖和蔗糖的含量，同时提高了果聚糖外切水解酶的活性，降低了蔗糖-1-果糖基转移酶和果聚糖-1-果糖基转移酶的活性。结果表明，花后WS通过改变茎中果聚糖催化酶的活性来促进碳水化合物储备的再动员。
Wheat plants were subjected to combined waterlogging and shading stress (WS) at 07, 815, 1623 and 2431 days after anthesis (DAA), respectively. Compared to the non-stressed plants, WS significantly decreased the final grain yield. Grain number was dramatically lowered by WS imposed at 07 DAA but hardly affected by other WS treatments; while the thousand-kernel-weight was unaffected by WS imposed at 07 DAA and lowered by other WS treatments. Photosynthate accumulation in the stem was decreased by WS imposed at 07 and 815 DAA, but was unaffected by WS imposed at later stages. Grain-filling rate was decreased, although the apparent remobilization of carbohydrate reserves from stem to grain was stimulated under WS. The carbohydrate reserves stored in the lower stem internodes were activated earlier and remobilized much more than those in the upper internodes; however, the proportion of the apparent remobilized reserves among the different stem internodes was consistent for all treatments. WS decreased contents of fructans, fructose and sucrose in the stem, which coincided with increased activity of fructan exohydrolase and decreased activities of sucrose-1-fructosyltransferase and fructan-1-fructosyltransferse. The results indicate that post-anthesis WS stimulated carbohydrate reserves remobilization by modifying the activities of the fructans-catalysing enzymes in the stem.