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首页> 外文期刊>Physiology and Molecular Biology of Plants >Causal shoot and root system traits to variability and plasticity in juvenile cassava (Manihot esculentaCrantz) plants in response to reduced soil moisture
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Causal shoot and root system traits to variability and plasticity in juvenile cassava (Manihot esculentaCrantz) plants in response to reduced soil moisture

机译：诸着少年木薯（Manihot Esculentacrantz）植物的变形和塑性的因果芽和根系特征，以应对土壤水分减少

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Cassava is an important source of food security and livelihoods for millions of consumers daily. Water deficit conditions are one of the major factors that affect the development of root system architecture (RSA) and consequently, crop productivity, and yet, due to its long maturity periods and bulky storage root systems, RSA studies in cassava are uncommon. The objective of this study was to identify traits that are responsible for the variability and plastic responses of cassava in response to drought at the juvenile stage of growth. Eight cassava genotypes were grown in soil-filled pots under well-watered and droughted conditions for up to 45 days and multivariate analyses employed to determine the major contributory traits to variability and the relative distance plasticity index (RDPI) was computed to evaluate plasticity. There were significant genotypic variations for most of the traits measured. Drought generally inhibited root production and development and the degree of inhibition was between 2 and 22%. Regardless of the soil moisture condition, traits which differentiated the RSA included root biomass, root numbers, root branching density, and total root length, and these were also the important contributory traits to variability under well-watered soil conditions. Important contributory traits to variability traits under drought were shoot-related traits such as leaf area and shoot biomass, and also root system traits such as nodal root number, root biomass, diameter and branching density. Phenotypic plasticity was found in most traits where the number, branching density and diameter of upper nodal roots presented the highest RDPI. These traits corresponded with the traits contributing greatly to variation. Plastic responses of cassava to drought were dependent on trait and genotype. It is concluded that upper nodal roots-related traits could have importance in breeding cassava to better tolerate water deficit conditions. The secondary growth and ability to maintain or increase the upper nodal root count or density under limited soil moisture may be related to good growth and yield performance of cassava under drought conditions. Upper nodal roots could be used to screen and select cassava genotypes adapted to drought at the juvenile stage but as a potential indirect selection strategy, the persistence and pertinence of these traits and their relationship with yield and yield components under drought conditions in the field must be confirmed.
机译：木薯是每天数百万消费者的粮食安全和生计的重要来源。水资源赤字条件是影响根系结构（RSA）的发展的主要因素之一，因此，作物生产力，然而，由于其长期成熟时期和庞大的储存根系，木薯的RSA研究罕见。本研究的目的是识别对Cassava的变异性和塑性反应负责对幼年阶段的干旱的变异性和塑性反应的特征。在含水良好的含水和脱水条件下，八个木薯基因型在含水量的罐中生长，最多45天，并且使用用于确定变异性和相对距离塑性指数（RDPI）的主要缴费性的多变量分析以评估可塑性。对于大多数测量的性状，存在显着的基因型变化。干旱通常抑制根系生产和发展，抑制程度为2％至22％。无论土壤水分状况如何，分化为RSA的特征都包括根生物量，根系，根部分支密度和总根长度，这些也是在含水良好的土壤条件下变异性的重要贡献性状。在干旱下的变异性状的重要贡献性状是射击相关性状，如叶面积和芽生物质，以及根系特征，如节点根数，根生物量，直径和分支密度。在大多数特征中发现表型可塑性，其中上节核头的数量，分支密度和直径呈现最高的RDPI。这些特征对应于对变异有很大贡献的特征。木薯对干旱的塑料反应依赖于特征和基因型。得出结论，上节核桃有关的性状可能具有育种木薯以更好地耐受水赤字条件的重要性。在有限的土壤水分下，维持或增加的二次生长和维持或增加的能力可能与干旱条件下木薯的良好生长和产量性能有关。上部核桃根可用于筛选和选择适应于少年阶段的干旱的木薯基因型，而是作为潜在的间接选择策略，这些特征的持续性和治疗方法和其在现场干旱条件下的产量和产量组分的关系确认的。

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