水稻移栽后苗期茎叶光合产物运转与分配特性研究

采用³H核素示踪方法，研究了水稻移栽后苗期茎叶光合产物的运转分配特性。结果表明，栽后4 d标记的茎鞘3H同化物在标记后10 d，有7.6%~9.8%运往新根，6.7%~15.6%运往主茎新叶，6.9%~9.9%运往分蘖茎叶；标记后30 d，约12%分配至新根，10%~14%分配至分蘖茎叶。标记后10~30 d参与再分配的同化物主要来自主茎茎鞘，输入器官主要为分蘖和新根。移栽后20 d标记叶片的3H同化物在标记后10 d，19%~28%分配至主茎新叶，4.6%~13.4%分配至分蘖，3%~5%运往新根。3个品种中，冈优22茎、叶光合产物分配到主茎中的比例较高，K优047分配到分蘖的比例较高，Ⅱ优162输送到新叶中的比例最大。

Characteristics of Photosynthate Transportation and Distribution at Seedling Stage after Transplanting in Rice

The experiment was conducted using three rice hybrid combinations by ³H-isotope tracer technique. The results showed that at 10 days after labeling, 7.6%–9.8% of ³H-assimilates of stem and sheath labeled at 4 days after transplanting transported to new roots, 6.7%–15.6% to new leaf blades of main stem, and 6.9%–9.9% to the stem and leaf of tillers; at 30 days after labeling, about 12% to new roots, and 10%–14% to the stem and leaf of tillers. The ³H-assimilates of redistribution during 10–30 days after labeling was mainly from stem and sheath of main stem, and imported to tillers and new roots. There was 19%–28% of leaf-labeled-³H-assimilates distributed to new leaves of main stem at 10 days after labeling, and about 4.6%–13.4% to tillers, moreover, still 3%–5% to new roots. Gangyou 22 had a higher percentage of ³H-assimilates distributed to main stem, Kyou 047 had a higher percentage to tillers and Ⅱyou 162 had a higher percentage to new leaf blades.