沙棘“生态经济育种”研究Ⅳ——干旱对沙棘杂种源库关系的生理学调节

Seabuckthorn Breeding on Eco-economy(Ⅳ)——Physiological Regulation of Drought to Source-Sink Relations of Seabuckthorn Hybridization

在鄂尔多斯半干旱地区,杂交沙棘高产株的优势,表现在表型指标:新梢数、果枝数、百叶重、单叶面积、总叶面积、果实数、百果重和果产量都明显高于中、低产株。生理指标:果实脱落率最低、果/叶比系数最小、净光合效率和日进程都最高、水分利用效率也高。高产株杂种优势的实质,是能自我调节、合理分配源(叶)与库(果)间物质流和能量流的结果,显示了高产株杂种在重组基因优势上能较好的适应恶劣的生态条件。

In Erdos semiarid area, the advantage of hybrid （heterosis） plants with high yield have the features as shown in the phenotype index： the branch number of new shoots, the number of berry branches, weight of 100 leaves, single leave＇ s area, total leaf area, amount of fruits, weight of 100 berries, and fruit yield of single plant, which are more significantly higher than the plants with middle and lower level fruit yield. Physiological indexes as follows, lower rate of fruit falling, the smallest coefficient of fruit/leaves, with the highest photosynthetic efficiency, water use efficiency and the fruit growth processes. The essence of hgh-yield hybrid plant is that they can self adjust and reasona- bly distribute the material and energy flow between the source （leaf） and library （fruit）, and the re- suits show that the plant with the high production hybrid has the advantage in the genetic restructu- ring and be better adapt to bad ecological conditions.