Effect of leaf structure and water status on carbon isotope discrimination in field-grown durum wheat
Effect of leaf structure and water status on carbon isotope discrimination in field-grown durum wheat
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DOI：
10.1046/j.1365-3040.1997.d01-43.x
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发表时间：
1997-12-01
影响因子：
7.3
通讯作者：
Nachit, MM
中科院分区：
文献类型：
--
作者：
Araus, JL;Amaro, T;Nachit, MM
研究了3种水分条件下硬粒小麦叶片和籽粒碳同位素差异（Delta）与叶片结构参数（光合能力指标）的关系。叶绿素和氮含量、单位叶面积干重测定了倒数第二叶的LDM（比叶面积的倒数）和碳同位素分辨率（δ），并对成熟籽粒的δ进行了分析，LDM和单位面积N均达到显著水平（P ≤ 0.001）负相关（r = -0.60和r =-0.36）。在雨养试验中，任何结构参数与叶片Delta的相关性很小或没有相关性。在两个雨养试验中，LDM是具有最强正相关的参数（P小于或等于0.001），具有内核Delta（r = 0.47和0.30）与籽粒产量（r = 0.43和0.29），而在灌溉试验中未发现相关性，这些相关性，而不是代表光合组织的数量和Delta之间的因果关系，可能是间接的协会所造成的平行效应或水分状况和物候对叶结构，粮食Delta和产量，试验间的相关性（即环境）之间的叶结构和德尔塔和产量是非常高的，虽然也是假的，我们的研究结果表明，LDM应该被用来剔除叶ii的内部光合能力的分离群体差异，只有在没有干旱的情况下，在此基础上进行籽粒Delta和产量的选择，对雨养试验具有一定的参考价值。
The relationships between leaf and kernel carbon isotope discriminations (Delta) and several leaf structural parameters that are indicators of photosynthetic capacity were studied in durum wheat grown in the field under three water regimens, A set of 144 genotypes were cultivated in two rain-fed trials, and 125 of these were grown under supplementary irrigation before heading. Total chlorophyll and nitrogen (N) contents, the dry mass per unit leaf area (LDM, the reciprocal of specific leaf area) and carbon isotope discrimination (Delta) were measured in penultimate leaves and Delta of mature kernels was also analysed, Both LDM and N per unit area showed significant (P less than or equal to 0.001) negative correlation (r = -0.60 and r = -0.36, respectively) with leaf Delta in the wettest trial, Little or no correlation was found for any structural parameter and leaf Delta in the rain-fed trials, In contrast, in the two rain-fed trials LDM was the parameter with the strongest positive correlation (P less than or equal to 0.001) with kernel Delta (r = 0.47 and 0.30) and grain yield (r = 0.43 and 0.29), whereas no correlation was found in the irrigation trial, These correlations, rather than representing a causal link between the amount of photosynthetic tissue and Delta, were probably indirect associations caused by a parallel effect or water status and phenology on leaf structure, grain Delta and yield, Correlations across trials (i.e. environments) between leaf structure and either Delta and yield were very high, although also spurious, Our results suggest that LDM should be used to cull segregating population differences in leaf ii based on the internal photosynthetic capacity only ire the absence of drought, Selecting for kernel Delta and grain yield on the basis of LDM is worthwhile for rain-fed trials.