Analysis of early vigour in twenty modern cultivars of bread wheat (Triticum aestivum L.)
Analysis of early vigour in twenty modern cultivars of bread wheat (Triticum aestivum L.)
复制标题
DOI：
10.1071/cp12169
复制
发表时间：
2012-01-01
影响因子：
1.9
通讯作者：
Tambussi, E. A.
中科院分区：
文献类型：
--
作者：
Maydup, M. L.;Graciano, C.;Tambussi, E. A.
幼苗叶面积的快速发育是增加早期资源获取的相关性状。小麦半矮秆基因型的使用降低了现代品种的早期活力。我们研究了在阿根廷种植的20个品种的早期活力，我们的主要目标是：(i)分析早期活力的基因型变异；（ii）研究可以作为早期活力良好指标的形态性状，如种子质量、叶宽和比叶面积；(3)确定增加根系干质量分配是否对早期活力有负面影响。在温室内进行了不选粒和选粒种子的试验。为了验证温室结果的可靠性，还进行了田间试验。种子质量是影响早期活力的主要参数。然而，通过大小选择种子（45-50 mg种子（-1））的实验结果表明，种子质量本身只能部分解释早期活力，因为在两个实验中（即随机选择或大小选择的种子），每个品种的幼苗叶面积之间存在显着的决定系数。我们观察到净同化率与移栽后品种早期活力等级随时间的变化之间有很高的决定系数。根系生物量与叶面积呈显著正相关，表明根系生物量与叶面积并不相互排斥。我们用多元回归建立了简单的模型来预测早期活力，包括一些容易测量的参数。种子质量和叶宽的拟合效果优于单独考虑种子质量和叶宽。结果表明，温室试验与田间试验的早活力决定系数显著；因此，在半控制条件下筛选早期活力可能是可行的。
Fast development of seedling leaf area is a relevant trait in order to increase early resource acquisition. The use of semi-dwarf genotypes of wheat has decreased early vigour of modern cultivars. We studied early vigour of 20 cultivars cropped in Argentina, and our main objectives were: (i) to analyse the genotypic variability in early vigour; (ii) to study morphological traits that can be good indicators of early vigour, such as seed mass, leaf width, and specific leaf area; and (iii) to determine whether increased dry mass allocation to roots impacts negatively on early vigour. Experiments with non-size-selected and size-selected seeds were carried out in a greenhouse. Afield trial was also conducted in order to test the reliability of the greenhouse results. Seeds mass was the main parameter related to early vigour. However, results from the experiment with seeds selected by size (45-50 mg seed(-1)) showed that seed mass per se only partially explains early vigour, since a significant coefficient of determination was observed between the seedling leaf area of each cultivar in both experiments (i.e. with randomly chosen or size-selected seeds).We observed a high coefficient of determination between net assimilation rate and changes in the ranking of early vigour of the cultivars with time after transplant. Root biomass was positively correlated with leaf area, indicating that the traits were not mutually exclusive. We built simple models by multiple regression to predict early vigour, including some parameters that were easy to measure. Seed mass and leaf width taken together showed better fit than seed mass or leaf width alone. We found a significant coefficient of determination between early vigour in greenhouse and field experiments; thus, screening for early vigour under semi-controlled conditions may be feasible.