Effects of salinity on distribution of photosynthates and carbohydrate metabolism in tomato grown using nutrient film technique.
Effects of salinity on distribution of photosynthates and carbohydrate metabolism in tomato grown using nutrient film technique.
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盐度对营养膜番茄光合产物分布和碳水化合物代谢的影响
DOI：
10.2503/jjshs1.78.90
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发表时间：
2009
影响因子：
--
通讯作者：
S. Nishimura
中科院分区：
文献类型：
--
作者：
Takeshi Saito;N. Fukuda;C. Matsukura;S. Nishimura
采用营养膜技术研究了盐胁迫对番茄果实中光合产物和蔗糖降解酶分布的影响。从第一朵花开花直到第二束的收获，施加将氯化钠添加到标准营养液中至EC为8.0dS/m2的盐处理。成熟红果期，盐处理的平均单果重为对照的59%。总可溶性固形物（白利糖度%）为6.5%，在控制和9.2%的盐度处理。单位叶面积光合速率随盐浓度的增加而降低。盐胁迫降低了番茄植株的13 C同化量，但显著增加了13 C同化物向果实的运输和分配。可溶性酸性转化酶和细胞壁酸性转化酶活性不受盐胁迫的影响，但蔗糖合成酶活性在果实发育过程中明显高于对照。我们的结论是，在果实中的总可溶性固形物的增加受到盐不仅是由于减少水分吸收所造成的冷凝，但积极运输的光合产物的水果，由于蔗糖降解酶的活性增加，特别是蔗糖合成酶。
Tomato plants were grown using a nutrient film technique to evaluate the effects of salinity on the distribution of photosynthates and sucrose-degrading enzymes in fruit in relation to sink strength. From first flower anthesis until harvest of the 2nd truss, saline treatment of sodium chloride added to the standard nutrient solution to an EC of 8.0 dS/m was applied. The average fruit weight in the salinity treatment was 59% of the control at the mature red stage. Total soluble solids (Brix%) were 6.5% in the control and 9.2% in the salinity treatment. The photosynthetic rate per unit leaf area was decreased by salinity treatment. Salinity decreased 13C assimilation in the whole tomato plant, while it increased the transport and distribution of 13C assimilates to the fruit significantly. The activities of soluble and cell wall-bound acid invertase were not affected by salinity; however, the activity of sucrose synthase in fruit exposed to the salinity was higher than that in the control during fruit development. We concluded that the increase in total soluble solids in fruit subjected to salinity was not only a result of condensation caused by reduced water uptake, but active transport of photosynthates to the fruit due to increase in sucrose-degrading enzyme activities, especially sucrose synthase.