Evidences for the association between carbon isotope discrimination and grain yield-Ash content and stem carbohydrate in spring wheat grown in Ningxia (Northwest China)

文献类型： 外文期刊

第一作者： Zhu, Lin

作者： Zhu, Lin;Liang, Zong Suo;Xu, Xing;Zhu, Lin;Xu, Xing;Zhu, Lin;Li, Shu Hua;Monneveux, P.

作者机构：

关键词： Wheat (Triticum aestivum L.);Carbon isotope discrimination;Grain yield;Harvest index;Water-soluble carbohydrate;Specific stem dry weight

期刊名称：PLANT SCIENCE （ 影响因子：4.729； 五年影响因子：5.132 ）

ISSN： 0168-9452

年卷期： 2009 年 176 卷 6 期

页码：

收录情况： SCI

摘要： Carbon isotope discrimination (Delta) has been repeatedly reported to positively correlate with grain yield in wheat grown under post-anthesis stress environments. Several hypotheses have been put forward to explain this association. However, there is few reported direct evidence clarified the relationship between Delta and grain yield, which is the objective of the present work. The relationships between Delta and grain yield (GY), harvest index (HI), ash content (m(a)), specific stem dry weight (SSDW) and carbohydrate in stem. were studied in a collection of 20 bread wheat cultivars (landraces, released cultivars and advanced lines) in Yinchuan of the Ningxia region (Northwest of China) in three successive years (2006, 2007 and 2008). Relationships between GY, HI, stem specific dry weight, accumulation and mobilization of stem reserved carbohydrate and Delta were analyzed. The effects of year, sampling time and genotypes on measured traits were significant. Positive correlations between grain yield and Delta were noted in 2007 and 2008 when stress occurred after anthesis, but not in 2006 when soil water condition was nearly optimal. Significant and positive correlations among m(a)L(m), grain Delta and harvest index were found. Stem water-soluble carbohydrate content(SWSCC) and specific dry weight 7 days after anthesis was positively associated with Delta. Remobilization efficiency of stem water-soluble carbohydrate and total carbohydrate (the sum of water-soluble carbohydrate and starch) was also found to be significantly and positively correlated to Delta. There were negative relationships between Delta G(m), Delta S(m), and SSDW at maturity. In conclusion, Delta may predict yield when irrigation does not meet crop's water requirement and wheat experiences a slight water stress after anthesis in central region of Ningxia. Delta or m(a)L(m) is related to the efficiency of carbon partitioning to the grain. Basal mature stem Delta seems to be an integrated character reflecting both early carbohydrate assimilation and dry matter remobilization to grain during grain-filling. (C) 2009 Elsevier Ireland Ltd. All rights reserved.

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