Quantitative evaluation of plastic root responses to contiguous water gradient in rice

IF 1 Q3 PLANT SCIENCES
Plant Root Pub Date : 2017-01-01 DOI:10.3117/PLANTROOT.11.70
Mana Kano‐Nakata, Y. Inukai, J. Siopongco, Shiro Mitsuya, A. Yamauchi
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引用次数: 5

Abstract

Root plasticity is the key trait for plant adaptation to environmental stresses. To quantify phenotypic plasticity to its full extent in potential, it needs to be evaluated under contiguous environmental changes. For that purpose, we used the combination of chromosome segment substitution lines (Nipponbare/Kasalath CSSLs) and line source sprinkler (LSS) system of irrigation. For analysis, we first attempted to apply the coefficient of variation (CV) and norm of reaction that have been used as the conventional approaches, and then propose a new approach for quantification of root plasticity. Results revealed that CV was not linked to root plasticity under contiguous water gradient in this study. In contrast, norm of reaction was linked to root plasticity and better explained with curve than linear, especially for CSSL50 (the most plastic genotypes) under such gradient. Based on the norm of reaction with curve, root plasticity was calculated using the difference in total root length between CSSLs and the recurrent parent, Nipponbare. Further analysis of root plasticity in relation to dry matter production was also done. By applying the new approach, we confirmed that root plasticity expression was affected by the intensities of drought stress and genotypes, indicating that such root plasticity is genetically controlled. In addition, root plasticity effectively contributed to the dry matter production under the drought conditions and maximized at around 20% of soil moisture content (–0.04 MPa). By using CSSLs and LSS system, we successfully evaluated root plasticity under contiguous water gradient.
水稻塑性根对连续水分梯度响应的定量评价
根系可塑性是植物适应环境胁迫的关键性状。为了充分量化表型可塑性的潜力,需要在连续的环境变化下对其进行评估。为此,我们采用了染色体片段代换系(Nipponbare/Kasalath CSSLs)和线源喷灌(LSS)灌溉系统的组合。为了进行分析,我们首先尝试应用变异系数(CV)和反应范数作为常规方法,然后提出了一种新的量化根塑性的方法。结果表明,在连续水梯度条件下,CV与根系可塑性无关。而反应范数则与根系可塑性有关,曲线比线性更能解释反应范数的变化,特别是在该梯度下的CSSL50(可塑性最强的基因型)。在曲线反应范数的基础上,利用CSSLs与亲本Nipponbare的总根长差计算根系可塑性。进一步分析了根系可塑性与干物质产量的关系。通过应用新方法,我们证实了根系可塑性表达受干旱胁迫强度和基因型的影响,表明这种根系可塑性是遗传控制的。此外,干旱条件下,根系可塑性对干物质生产有显著促进作用,在土壤含水量20%左右(-0.04 MPa)时达到最大值。利用CSSLs和LSS系统,成功地评价了连续水梯度条件下根系的可塑性。
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来源期刊
Plant Root
Plant Root PLANT SCIENCES-
CiteScore
1.50
自引率
0.00%
发文量
2
期刊介绍: Plant Root publishes original papers, either theoretical or experimental, that provide novel insights into plant roots. The Journal’s subjects include, but are not restricted to, anatomy and morphology, cellular and molecular biology, biochemistry, physiology, interactions with soil, mineral nutrients, water, symbionts and pathogens, food culture, together with ecological, genetic and methodological aspects related to plant roots and rhizosphere. Work at any scale, from the molecular to the community level, is welcomed.
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