Functional roles of root plasticity and its contribution to water uptake and dry matter production of CSSLs with the genetic background of KDML105 under soil moisture fluctuation
Functional roles of root plasticity and its contribution to water uptake and dry matter production of CSSLs with the genetic background of KDML105 under soil moisture fluctuation
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DOI：
10.1080/1343943x.2018.1477509
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发表时间：
2018-05
影响因子：
2.5
通讯作者：
Stella Owusu-Nketia;J. L. Siangliw;M. Siangliw;T. Toojinda;A. Vanavichit;Noppon Ratsameejanphen;Mathurada Ruangsiri;Sararin Sriwiset;R. Suralta;Y. Inukai;Shiro Mitsuya;Mana Kano‐Nakata;Dinh Thi Ngoc Nguyen;Kabuki Takuya;A. Yamauchi
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文献类型：
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作者：
Stella Owusu-Nketia;J. L. Siangliw;M. Siangliw;T. Toojinda;A. Vanavichit;Noppon Ratsameejanphen;Mathurada Ruangsiri;Sararin Sriwiset;R. Suralta;Y. Inukai;Shiro Mitsuya;Mana Kano‐Nakata;Dinh Thi Ngoc Nguyen;Kabuki Takuya;A. Yamauchi
雨养低地（RFL）水稻生态系统中降雨不稳定引起的土壤水分波动（SMF）胁迫对水稻生产产生负面影响。在这种条件下，根系可塑性是植物适应的关键性状之一。以3个以KDML105为主要遗传背景、8号染色体上有一个共同取代片段的染色体片段代换系（CSSLs）为材料，研究了SMF条件下根系可塑性表达及其在水分吸收、干物质生产和产量中的功能作用。SMF处理下，CSSLs的茎部干物质产量高于KDML105，这可能是由于维持了气孔导度，使籽粒产量更高。由于促进了节点根和侧根的产生，以总根长为基础的根系发育显著高于KDML105。这些结果表明，3个CSSLs的8号染色体上的共同取代片段可能负责SMF下根系可塑性的表达，并有助于增加水分吸收，从而增加干物质生产和产量。这些CSSLs可作为土壤湿度波动的雨育低地条件下抗旱育种计划的良好遗传物质来源，并为进一步的遗传研究阐明根系可塑性的机制提供遗传材料。
ABSTRACT Soil moisture fluctuation (SMF) stress due to erratic rainfall in rainfed lowland (RFL) rice ecosystems negatively affect production. Under such condition, root plasticity is one of the key traits that play important roles for plant adaptation. This study aimed to evaluate root plasticity expression and its functional roles in water uptake, dry matter production and yield under SMF using three chromosome segment substitution lines (CSSLs) with major genetic background of KDML105 and a common substituted segment in chromosome 8. The CSSLs showed greater shoot dry matter production than KDML105 under SMF, which was attributed to the maintenance of stomatal conductance resulting in higher grain yield. The root system development based on total root length of the CSSLs were significantly higher than that of KDML105 due to the promoted production of nodal and lateral roots. These results implied that the common substituted segments in chromosome 8 of the 3 CSSLs may be responsible for the expression of their root plasticity under SMF and contributed to the increase in water uptake and consequently dry matter production and yield. These CSSLs could be used as a good source of genetic material for drought resistance breeding programs targeting rainfed lowland condition with fluctuating soil moisture environments and for further genetic studies to elucidate mechanisms underlying root plasticity.