Role of water relations and photosynthesis in the release of buds from apical dominance and the early reinvigoration of decapitated poplars
Role of water relations and photosynthesis in the release of buds from apical dominance and the early reinvigoration of decapitated poplars
复制标题
水关系和光合作用在芽从顶端优势的释放和断头杨的早期恢复中的作用
DOI：
10.1111/j.1399-3054.1986.tb01928.x
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
T. Tschaplinski
中科院分区：
文献类型：
--
作者：
T. Blake;T. Tschaplinski
杂交杨树幼枝砍头后1 h木质部压力势的下降。×Populus nigra L. cv。DN22)在断头后3 d内降低了气孔导度和蒸腾速率。这种早期水分胁迫在斩首后4 ~ 5 d得到缓解，导致气孔开度、蒸腾和净光合速率大幅增加，并在一周的剩余测量期内持续增加。结果表明：在短暂的水分胁迫后，无头处理通过提高根/冠比和减少茎部对水分的竞争来提高水分有效性；水合作用的改善使芽从顶端优势中释放出来，增加气孔导度和净光合作用速率。这反过来又会导致植物在被斩首后恢复活力时加速生长。
A decrease in xylem pressure potential starting 1 h after decapitation of young hybrid poplars (Populus deltoides Bartr. ×Populus nigra L. cv. DN22) reduced stomatal conductance and transpiration rates for the first 3 days after decapitation. This early moisture stress was alleviated 4 to 5 days after decapitation, resulting in substantial increases in stomatal aperture, transpiration and net photosynthetic rates which continued for the remainder of the one week measurement period. The results suggest the following sequence of events in the decapitated plant: After a brief moisture stress, decapitation increases moisture availability by increasing the root/shoot ratio and by reducing shoot competition for moisture. Improvement in hydration releases buds from apical dominance and increases stomatal conductance and rates of net photosynthesis. This, in turn, leads to the acceleration of growth observed when plants are reinvigorated by decapitation.