Plasticity in root system architecture of rice genotypes exhibited under different soil water distributions in soil profile
Plasticity in root system architecture of rice genotypes exhibited under different soil water distributions in soil profile
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DOI：
10.1080/1343943x.2019.1608836
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发表时间：
2019-04-29
影响因子：
2.5
通讯作者：
Yamauchi, Akira
中科院分区：
文献类型：
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作者：
Kano-Nakata, Mana;Nakamura, Tomomichi;Yamauchi, Akira
根系构型（RSA）已被报道是由几个根性状，如分支，伸长，和生长角度。本研究的目的是评估的基因型变异的可塑性在响应不同的土壤水分分布在土壤剖面。IR 64（浅根系统）、YTH 183（由于根伸长的高可塑性而适应降雨的低地条件）和Kinandang Patong（KP -深根系统）在PVC根箱中在连续水淹条件和土壤湿度波动（SMF）下生长34天。对于SMF，从根箱的顶部（TI-SMF）或从根箱的底部（BI-SMF）进行浇水。BI-SMF中的水分梯度比TI-SMF中更明显，而两种SMF处理中第一次灌溉后根箱中的平均土壤含水量保持在23%（v/v）左右。在所有品种中，RSA随SMF的变化都很大，所有这些品种的根系分布都倾向于向更深的土层转移。这种变化主要是由于侧根和节根发育过程中表现出的不同程度的可塑性所致。与IR 64和KP相比，YTH 183在SMF条件下表现出更强的改变根系生长角度的能力，从而使根系分布在更深的土层中，表明YTH 183有助于提高适应SMF的品种的RSA。
The root system architecture (RSA) has been reported to be determined by several root traits such as branching, elongation, and growth angle. This study aimed to evaluate the genotypic variation of plasticity in RSA in response to different soil water distributions in a soil profile. IR64 (shallow root system), YTH183 (adapted to rainfed lowland conditions due to high plasticity in root elongation), and Kinandang Patong (KP - deep root system) were grown in PVC root boxes for 34 days under continuously waterlogged conditions and with soil moisture fluctuations (SMF). For SMF, watering was done from the top of the root box (TI-SMF) or from the bottom of the root box (BI-SMF). A water gradient was observed more clearly in BI-SMF than in TI-SMF, while mean soil moisture content in the root box was kept at around 23% (v/v) after first irrigation in both SMF treatments. RSA changed drastically with SMF in all cultivars, all of which tended to shift root distribution to deeper soil layers in response to SMF. Such changes in RSA resulted from different degrees of plasticity exhibited mainly in nodal root and L-type lateral root development. YTH183 showed a greater ability to change its root growth angle and thus its root distribution in the deeper soil layer compared to IR64 and KP under SMF, indicating that YTH183 could help to improve RSA in cultivars adapted to SMF.