Physiological characteristics of hybrid rice roots.
1989
Yang H. | Sun X.
During field experiments in 1983 and 1984, the morphological, physiological, and biochemical functions of root systems of hybrid combinations were evaluated at transplanting, tillering, panicle differentiation, booting, heading, and milk stages to improve late modern varieties (MV). The hybrids used were Shan-You 6 (Zhen-Shan 97 A/IR26) and Wei-You 6 (Wei 20 A/IR26); the late rices were Zhao-Jin-Fong 5, Zhe-Gen 6, and Nong-Hu 3-2. The hybrids had larger and deeper root systems than the conventional varieties. The root system density of hybrids was twice that of MVs. The superficial roots of hybrids were more developed and vital, about 4-5 times heavier than those of the MVs. The hybrids were stronger in aerobic respiration and energy metabolism than MVs. Dehydrogenase and cytochrome oxidase activity and the root system oxidizing power were much higher in all developmental stages. Adenotriphosphate of root systems was also much greater. The oxidizing power of root systems at heading correlated positively with grain yield (r= 0.932* ). More interesting is the closer relationship between the oxidizing power of the superficial root and grain yield (0.954* ). Dehydrogenase activities correlated significantly with grain yield at transplanting (0.956** ) and at heading (0.946** ). ATP content correlated significantly with yield at transplanting (0.958** ) and at heading (0.897* ).
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