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Narrow root cone angle promotes deeper rooting, cooler canopy temperatures and higher grain yield in a rice (Oryza sativa L.) recombinant inbred line population grown under different water availabilities in aerobic production systems
Field Crops Research ( IF 5.8 ) Pub Date : 2023-06-01 , DOI: 10.1016/j.fcr.2023.108989
Ricky Vinarao, Christopher Proud, Peter Snell, Shu Fukai, Jaquie Mitchell

Context

Rice crops are one of the world’s major consumers of irrigation water. With water becoming more limited, water-saving aerobic production (AP) systems may provide an alternative to traditional flooded culture. Genotypes with narrow root cone angle (RCA) and subsequently deeper rooting systems are hypothesised as key for AP adaptation ensuring water uptake at depth.

Objective and Methods

Using a recombinant inbred line (RIL) population and differential genotypes (narrow and wide RCA groups) derived from a Sherpa/IRAT109 cross, a glasshouse experiment and four field experiments with different water inputs in well-watered (WW, in two seasons), mild water deficit (MWD), and intermittent water deficit (IWD) conditions were carried out to characterise the relationship of RCA with grain yield (GY) and key physiological traits.

Results

Significant genotypic variation and group differences were found in root traits, canopy temperature and GY. Expression of genotypes with narrow RCA were found to be consistent across experiments and water availability conditions. Genotypes in the narrow RCA group produced a greater proportion of roots below 20 cm (7.4–17.7%), longer total root length (69.7%), cooler canopies (0.3–1.0 °C) and higher GY (14–62%) compared with wide RCA group. Two promising RILs were identified which expressed high GY in WW (12.0–13.4 t/ha) conditions while maintaining GY in IWD (up to 9.4 t/ha). Higher GY was obtained in genotypes with cooler canopies (r = −0.72) and narrow RCA (r = −0.39) in IWD. Narrower RCA was associated with higher total root length (r = −0.70) and higher stomatal conductance (r = −0.71) in the glasshouse and proportion of deep roots (r = −0.65) and cooler canopies (r = 0.66) in the field.

Conclusions

To our knowledge, this was one of the foremost studies exploring and demonstrating such relationships in rice AP systems. Root traits determined in the field were congruent with the other root-related traits driving differences between RCA groups measured in the glasshouse providing confidence with the field phenotyping methods. This work demonstrated the advantage conferred by the development of narrow RCA in aerobic conditions, presented improved physiological understanding of RCA and with genomics assisted breeding, is considered valuable for the development of AP-adapted, sustainably produced rice.



中文翻译:

窄根锥角促进水稻(Oryza sativa L.)重组自交系种群在有氧生产系统中不同水分利用度下的生根更深、冠层温度更低和籽粒产量更高

语境

水稻作物是世界上灌溉用水的主要消耗者之一。随着水变得越来越有限,节水有氧生产 (AP) 系统可能会成为传统淹没式养殖的替代方案。具有窄根锥角 (RCA) 和随后更深根系的基因型被假设为 AP 适应确保深度吸水的关键。

目的与方法

使用来自 Sherpa/IRAT109 杂交的重组近交系 (RIL) 种群和差异基因型(窄和宽 RCA 组)、温室实验和四次在灌溉良好(WW,两个季节)中进行不同水输入的田间实验,进行了轻度缺水 (MWD) 和间歇性缺水 (IWD) 条件,以表征 RCA 与谷物产量 (GY) 和关键生理性状的关系。

结果

在根系性状、冠层温度和 GY 方面发现了显着的基因型变异和群体差异。发现具有窄 RCA 的基因型的表达在实验和可用水条件下是一致的。窄 RCA 组中的基因型产生了更大比例的 20 厘米以下的根 (7.4–17.7%)、更长的总根长度 (69.7%)、较冷的树冠 (0.3–1.0 °C) 和更高的 GY (14–62%) 相比与广泛的 RCA 集团。确定了两个有前途的 RIL,它们在 WW(12.0-13.4 t/ha)条件下表达高 GY,同时在 IWD(高达 9.4 t/ha)中保持 GY。 在 IWD 中具有较冷冠层 ( r  = -0.72) 和窄 RCA ( r = -0.39) 的基因型中获得了更高的 GY。较窄的 RCA 与较高的总根长相关(r = −0.70) 和温室中 更高的气孔导度 ( r = −0.71) 以及田间深根 ( r  = −0.65) 和较冷的冠层 ( r  = 0.66) 的比例。

结论

据我们所知,这是探索和展示水稻 AP 系统中这种关系的最重要的研究之一。在田间确定的根性状与在温室中测量的 RCA 组之间驱动差异的其他根相关性状一致,为田间表型分析方法提供了信心。这项工作证明了在有氧条件下发展窄 RCA 所赋予的优势,提高了对 RCA 的生理学理解和基因组学辅助育种,被认为对开发适应 AP 的可持续生产的水稻很有价值。

更新日期:2023-06-01
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