Effect of fruit-load on growth patterns of fruit at the middle nodes of gynoecious-type cucumbers
Effect of fruit-load on growth patterns of fruit at the middle nodes of gynoecious-type cucumbers
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DOI：
10.1080/14620316.2005.11511903
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发表时间：
2005-01-01
影响因子：
1.9
通讯作者：
Sugiyama, N
中科院分区：
文献类型：
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作者：
Hikosaka, S;Sugiyama, N
以全雌单性结实黄瓜（Cucumis sativus L.）为试材，研究了下部节位（4 ~ 7节位）不同疏果时间对上部节位果实生长和败育的影响。“NK x AN 8”在第8节花开花后0、5、10、15和20 d（DAA（8））摘除下部节的果实。然后监测单个果实的总叶面积和生长模式。当第4 - 7节的果实在花后0或5天疏果（8）时，第8 - 12节的所有果实都生长到商业大小，而没有果实败育。当疏果10 DAA（8）时，第8至12节的果实在开花后停止生长，但在疏果后几天恢复生长。花后15或20天疏果（8）迫使第8 ~ 12节的大多数果实败育，而第13节及以上的果实停止生长一段时间，但疏果后恢复生长。在所有处理中，总叶面积在整个实验中随时间增加。播后65 ~ 75 d，高载果量对叶面积增长速率有一定的抑制作用。在花后20天，第4至7节的果实被削薄之前，每叶面积的果实负荷（鲜重）约为50 mg cm（-2）（8）。这些结果表明，如果果实在较低的节持续很长时间，和果实在中间节衰老之前扩大发生败育。下部节位疏果可在10 d内使处于生长停滞期的果实恢复生长。
The effects of different timings of fruit thinning at the lower nodes (nodes 4 to 7) on fruit growth and abortion at higher nodes were investigated in a gynoecious, parthenocarpic cultivar of cucumber (Cucumis sativus L.), 'NK x AN8' Fruits at the lower nodes were removed 0, 5, 10, 15 and 20 d after anthesis of flowers at node 8 (DAA(8)). Total leaf areas and growth patterns of individual fruit were then monitored. When fruits at nodes 4 to 7 were thinned 0 or 5 DAA(8), all fruits at nodes 8 to 12 grew to commercial size, without fruit abortion. When fruits were thinned 10 DAA(8), the fruits at nodes 8 to 12 ceased to grow after anthesis, but growth was restored a few days after fruit thinning. Fruit thinning at 15 or 20 DAA(8) forced most fruits at nodes 8 to 12 to abort, while fruits at node 13 and above ceased to grow for a while, but resumed growth after fruit thinning. In all treatments, total leaf area increased with time throughout the experiment. High fruit load depressed the rate of growth of leaf area slightly, 65 to 75 d after sowing. Fruit load (fresh weight) per leaf area was about 50 mg cm(-2) just before fruits at nodes 4 to 7 were thinned at 20 DAA(8). These results suggest that fruit abortion occurs if fruits at the lower nodes persist for a long period, and fruits at the middle nodes senesce before enlargement. Fruit thinning at the lower nodes can restore the growth of fruits in the stagnant growth phase within 10 d.