Root system characteristics under different water regimes in three cereal species

IF 1 Q3 PLANT SCIENCES Plant Root Pub Date : 2021-01-01 DOI:10.3117/PLANTROOT.15.10
Natsumi Ueda, Shiro Mitsuya, A. Yamauchi, Maria Corazon J. Cabral, Mana Kano‐Nakata
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Abstract

: Water stress such as drought and waterlogging is considered to be a major limiting factor in crop production. Roots play important roles in crop adaptation to water stress. This study aimed to characterize the vertical root distribution patterns and analyze the root-shoot relationships of different cereal species with different water requirements in response to different soil moisture conditions. Sorghum, maize, and rice were grown under 5% w/w soil moisture content (SMC5), 20% w/w soil moisture content (SMC20) and in waterlogged soil (WL) for 35 days using root box pin-board method. For sorghum and maize, the optimal soil water condition was SMC20 which produced the greatest shoot and root growth, while rice had greatest shoot and root growth under WL. Sorghum significantly increased root to shoot ratio in both water stress conditions, suggesting that sorghum prioritizes carbon partitioning of assimilates towards the roots. Although whole root dry weight and total root length were reduced by water stress, vertical distribution of root traits varied with soil water conditions and promoted root response was observed in specific soil layer. A highly posi tive relationship between root and shoot traits was observed in rice, suggesting that root and shoot trait responses are coupled with changing soil water conditions. Further studies are needed to confirm root architectural changes focusing on differ ent root component traits as well as other root traits related to root architectural structure.
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不同水分条件下3种谷物根系特征
如干旱和内涝等水分胁迫被认为是作物生产的主要限制因素。根系在作物适应水分胁迫中起着重要作用。本研究旨在表征不同需水量谷物品种根系垂直分布格局,分析不同土壤水分条件下不同需水量谷物品种的根冠关系。采用根箱钉板法,在土壤含水量5% (SMC5)和20% (SMC20)条件下,在渍水土壤(WL)上种植高粱、玉米和水稻35 d。高粱和玉米的最佳土壤水分条件为SMC20,其地上部和根系生长最好,而水稻在WL条件下的地上部和根系生长最好。两种水分胁迫条件下,高粱的根冠比均显著提高,说明高粱同化物的碳分配优先向根系分配。水分胁迫虽然降低了全根干重和总根长,但根系性状的垂直分布随土壤水分条件的变化而变化,在特定土层中促进了根系的响应。水稻根系和茎尖性状之间存在高度正相关,表明根系和茎尖性状的响应与土壤水分条件的变化相耦合。需要进一步的研究来证实以不同根成分性状为中心的根结构变化,以及与根结构结构相关的其他根性状。
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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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