Physio-Morphological Characters of F1 Hybrids of Rice (Oryza sativa L.) in Japonica-Indica Crosses: II. Heterosis for leaf area and dry matter accumulation
Physio-Morphological Characters of F1 Hybrids of Rice (Oryza sativa L.) in Japonica-Indica Crosses: II. Heterosis for leaf area and dry matter accumulation
复制标题
粳稻杂交F1代的生理形态特征：II．
DOI：
10.1626/pps.4.202
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发表时间：
2001
影响因子：
2.5
通讯作者：
I. Nakamura
中科院分区：
文献类型：
--
作者：
Mohammad Abu Zaman Sarker;S. Murayama;Y. Ishimine;I. Nakamura
摘要通过盆栽试验，研究了12个粳稻与籼稻杂交组合Fj的形态优势和分蘖期、开花期和成熟期部分性状之间的关系。各生育期株高、分蘖数、绿叶面积和单株干物质积累均为正优势。分蘖数、单株叶面积和干物质积累在分蘖活跃期杂种优势强度较高。分蘖期和开花期分蘖数与单株叶面积呈极显著正相关。各生育期叶面积与干物质积累量、分蘖数与单株干物质积累量均呈显著正相关。前期单株叶面积与后期单株干物质积累量呈极显著正相关，说明前期叶面积发育是1号杂交种高干物质积累的重要因素。虽然部分Fx杂交种在开花期由于叶片过早衰老，死叶率杂种优势为正，但Fx杂交种在开花期叶面积更大，直到熟熟期，Fx杂交种的叶片保持绿色的时间也比亲本长。
Summary A pot experiment was conducted to investigate the heterosis for morphological characters and to examine the relationship among some characters at active tillering, flowering and dough ripe stages of 12 Fj hybrids from crosses between japonica and indica rice. Heterosis for plant height, number of tillers, green leaf area and dry matter accumulation per plant was positive at all stages. The intensity of heterosis was higher at the active tillering stage for number of tillers, leaf area and dry matter accumulation per plant. A significant positive relationship was found between tiller number and leaf area per plant at active tillering and flowering stages. Significant positive relationships between leaf area and dry matter accumulation, and between tiller number and dry matter accumulation per plant were observed at all stages. A significant positive relationship was found between leaf area per plant at an early stage and dry matter accumulation per plant at a later stage, suggesting that early development of leaf area is an important factor for higher dry matter accumulation in 1 hybrids. Although heterosis for percent dead leaf blade was positive at the flowering stage due to early leaf senescence in some Fx hybrids, a larger leaf area was also found in Fx hybrids at this stage and leaves of Fx hybrids remained green longer compared to parent cultivars up to the dough ripe stage.