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首页> 外文期刊>Genetic Resources and Crop Evolution >Genetic analysis and phenotypic characterization of leaf photosynthetic capacity in a sorghum (Sorghum spp.) diversity panel
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Genetic analysis and phenotypic characterization of leaf photosynthetic capacity in a sorghum (Sorghum spp.) diversity panel

机译：高粱（Sorghum spp。）多样性面板中叶片光合能力的遗传分析和表型表征

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摘要

Carbon assimilation is the fundamental basis of crop productivity, but this important and complex trait has not been genetically characterized and directly exploited at the commercial level to improve yield. Therefore, there is a critical need to determine natural genetic variation in carbon assimilation, to advance our knowledge of the genetic mechanisms controlling this trait and, on that basis, to develop germplasm with superior photosynthetic capacity. Sorghum is the most productive annual species for biofuel production in which leaf photosynthetic capacity has been associated with biomass yield. In this study, a set of 82 sorghum accessions was genetically characterized and phenotypically evaluated for carbon assimilation (A), stomatal conductance (g(s)), transpiration rate (T), efficiency of energy capture by open PSII reaction centers (Fv'/Fm'), effective quantum yield (I broken vertical bar(PSII)) and photochemical quenching (qP). Phenotypic variation was observed for all traits, with A ranging from 11.6 to 42.5 A mu mol CO2 m(-2) s(-1). The highest positive correlations were between A and I broken vertical bar(PSII) (r = 0.71), g(s) and T (r = 0.89) and I broken vertical bar(PSII) and qP (r = 0.91). The highest negative correlations were between g(s) and A/g(s) (r = -0.82), T and A/g(s) (r = -0.79), T and A/T (r = -0.79) and A/g(s) and A/T (r = -0.78). Population structure and cluster analysis clearly differentiated three subpopulations among this set of accessions with significantly different values for A, g(s) and Fv'/Fm'. This study demonstrates that this diverse set of sorghum accessions could be utilized to identify genes/markers associated with variation in leaf photosynthetic rate and could be exploited in breeding programs to develop germplasm with superior carbon assimilation capacity.
机译：碳同化是作物生产力的基本基础，但是这一重要而复杂的特征尚未经过遗传学表征，而是在商业水平上直接用于提高产量。因此，迫切需要确定碳同化的自然遗传变异，以提高我们对控制该性状的遗传机制的认识，并在此基础上发展具有优异光合作用能力的种质。高粱是用于生物燃料生产的生产力最高的年度物种，其中叶片的光合作用能力与生物量产量相关。在这项研究中，对82个高粱种质进行了遗传鉴定，并通过表型评估了碳同化（A），气孔导度（g（s）），蒸腾速率（T），开放PSII反应中心捕获能量的效率（Fv' / Fm'），有效量子产率（I垂直折线（PSII））和光化学猝灭（qP）。观察到所有性状的表型变异，A范围从11.6至42.5 Aμmol CO2 m（-2）s（-1）。最高的正相关是在A和I垂直折线（r = 0.71），g（s）和T（r = 0.89）和I垂直折线（PSII）和qP（r = 0.91）之间。最高的负相关在g（s）和A / g（s）之间（r = -0.82），T和A / g（s）（r = -0.79），T和A / T（r = -0.79）之间和A / g（s）和A / T（r = -0.78）。种群结构和聚类分析清楚地区分了这组种质中的三个亚群，其A，g（s）和Fv'/ Fm'值明显不同。这项研究表明，这套不同的高粱种可用于鉴定与叶片光合速率变化相关的基因/标记，并可在育种计划中用于开发具有优异碳同化能力的种质。

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