节水抗旱稻旱优113号的根系生长对土壤水分亏缺的响应

doi:10.3864/j.issn.0578-1752.2017.22.004

Abstract

Abstract: 【Objective】 The objective of this paper is to reveal root morphological and physiological changing characteristics of water-saving and drought-resistant rice under soil water deficit condition, and to illuminate its specific physiological basis of water-saving and drought-resistance. 【Method】 Pot experiments were conducted in 2015 and 2016, and one water-saving and drought-resistant rice genotype (HY113) and one high-yielding rice genotype (YLY6) were used under two water treatments, including flooding irrigation and drought treatment. The drought effects on root morphological and physiological traits of the two rice genotypes and their relationship with aboveground biomass accumulation were studied.【Result】Compared with flooding irrigation, drought stress significantly reduced the dry matter accumulation of the two rice genotypes, and the root-shoot ratio of HY113 was also decreased significantly (from 0.18 to 0.12), while the root-shoot ratio of YLY6 was not changed. Under drought stress, the root activity of the two rice genotypes both increased significantly. In 2015 and 2016, the average increase percentage of HY113 was 38.7% at milky stage, while that of YLY6 was 22.8%, and the root activity of HY113 increased from 86 μg·g^-1·h^-1 to 174 μg·g^-1·h^-1at milky stage in 2015. Drought treatment also significantly reduced the root absorption area of both two genotypes, but the reduction percentage of HY113 was significantly lower than that of YLY6. Compared with high-yielding rice YLY6, HY113 had smaller root number, root volume and root dry weight, and the total dry matter accumulation was also significantly lower, but its root activity and root absorption area were greater. 【Conclusion】The water-saving and drought-tolerant rice genotype HY113 possesses less root biomass but higher root uptake efficiency, and it could reduce the root-shoot ratio under drought condition to make more dry matter stay in the aboveground part, so that the relatively high grain yield could be maintained.

Key words: water-saving and drought-resistant rice, water deficit, root-shoot ratio, root characteristics

BU HongYing, SONG WeiZhou, CAO CouGui, LI Ping. Root Growth Responses to Soil Water Deficit for a Water-Saving and Drought-Resistant Rice Genotype Hanyou113[J].Scientia Agricultura Sinica, 2017, 50(22): 4277-4289.

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Root Growth Responses to Soil Water Deficit for a Water-Saving and Drought-Resistant Rice Genotype Hanyou113

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