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用放射性同位素示踪技术,测定早、晚季10多个杂交水稻及其亲本中~(32)P、~(14)C在分蘖的分布(％),并统计其分蘖数量与~(32)P、~(14)C的相关性。结果表明,多数杂交水稻的分蘖数量与~(32)P在分蘖的分布(％)呈显著或极显著正相关,而与~(14)C也呈正的相关性;杂交水稻的生长势(苗高、苗重、根长、根重),普遍比亲本和“双桂36”好;光合强度和根的呼吸强度,除L301A×R29以外,其余均较高。还讨论了杂交水稻分蘖力,分蘖数量与谷粒产量的关系,以及~(32)P、~(14)C在分蘖分布(％)作为预测杂种优势的可能性。
The distribution of ~ (32) P and ~ (14) C in tillers of more than 10 hybrid rice and their parents in early and late seasons were determined by radioisotope tracer technique, and the number of tillers and ~ (32) P, ~ (14) C correlation. The results showed that the tiller number of most hybrid rice was significantly or very significantly positively correlated with the distribution of ~ (32) P in tiller and positively correlated with ~ (14) C. The growth potential of hybrid rice High, seedling weight, root length and root weight) were higher than the parents and “Shuanggui 36”. The photosynthetic intensity and root respiration intensity were higher except L301A × R29. The relationship between tillering ability, tillering yield and grain yield of hybrid rice was also discussed, and the tiller distribution of ~ (32) P and ~ (14) C was predicted as the potential heterosis.