椪柑萎缩型枯水病和粒化型枯水病几种生理指标差异的研究

Studies on the difference of some physiological indexes of vesicle collapse and granulation of Ponkan mandarin fruit

分析了椪柑萎缩型枯水与粒化型枯水以及正常果的生理差异。发现萎缩型枯水果的失重、呼吸速率显著高于粒化型枯水果,但其果肉水势和出汁率显著低于粒化型枯水果和正常果;萎缩型枯水与粒化型枯水一样,其脱落酸大量积累,14C-葡萄糖大量转化为不溶性物质。认为萎缩型枯水机理在于椪柑果实大量失水引发了逆境生理代谢,导致大量可溶性营养消耗,汁胞萎缩崩溃。

The physiological differences among vesicle collapse fruit and granulation fruit and normal fruit of Ponkan mandarin (Citrus reticulata Blanco) were measured in this study. The results showed that the weight loss and respiratory rate in vesicle collapse fruit were significantly higher than those of granulated fruit and normal fruit, but the water potential and juice yield were significandy lower than those of the latter fruit in juice vesicles. The abscisic acid was accumulated largely in vesicle collapse fruit, and a large number of 14C-labelled glucose in vesicle collapse fruit was transformed into insoluble materials , as granulated fruit did. These results indicated that the physiological mechanism of vesicle collapse might be due to the change of the normal metabolism induced by rapid and severe loss of moisture in fruit, and made the soluble nutritive material reduced and the juice vesicles collapsed.