Environmental Effects on Dynamics of Fruit Growth and Photoassimilate Translocation in Tomato Plants. (2). Analysis of Phloem Sap and Xylem Sap Fluxes and Fruit Water Balance.
Environmental Effects on Dynamics of Fruit Growth and Photoassimilate Translocation in Tomato Plants. (2). Analysis of Phloem Sap and Xylem Sap Fluxes and Fruit Water Balance.
复制标题
环境对番茄植株果实生长动态和光同化物易位的影响。
DOI：
10.2525/ecb1963.39.43
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. Araki
中科院分区：
文献类型：
--
作者：
M. Kitano;T. Araki
番茄果实水分平衡的研究分析了光照和气温对韧皮部和木质部运输的影响。通过花梗的韧皮部汁液和木质部汁液通量的单独评估，使合作应用的多室系统测量膨胀生长和气体交换的速率在水果和热环的方法抑制韧皮部运输通过花梗。通过花梗的液流有80%以上用于果实的膨胀生长，剩余的液流（略低于20%）通过有花萼和花梗的果实蒸腾而损失。韧皮部液流是影响果实水分平衡的最主要因素，约70%的液流是由韧皮部运输进入果实的，光照和气温的升高可促进光合作用和呼吸作用的增加。与韧皮部液流相比，木质部液流是果实水分平衡中的次要组分，对温度升高不太敏感。因此，通过花梗的韧皮部汁液和木质部汁液通量的单独评估可以被认为是提供有用的信息质量积累到番茄果实。
Water balance in a growing fruit of tomato (Lycopersicon esculentum Mill.) as affected by irradiance and air temperature was analyzed with special reference to phloem and xylem transport. Separate evaluations of phloem sap and xylem sap fluxes through the pedicel were enabled by the cooperative application of the multiple chamber system for measuring rates of expansive growth and gas exchange in the fruits and the heat-ring method for inhibiting phloem transport through the pedicel. A little more than 80% of sap flux through the pedicel contributed to fruit expansive growth, and the residual (i.e. a little less than 20%) was lost by transpiration from the fruit with calyx and pedicel. The most dominant component of fruit water balance was phloem sap flux, and about 70% of sap accumulated into the fruit was brought by phloem transport, which was significantly accelerated with leaf photosynthesis and fruit respiration activated by lighting and rise in air temperature after the start of the light period. Xylem sap flux found to be a minor component in fruit water balance and less sensitive to the temperature rise as compared with phloem sap flux. Thus, the separate evaluations of phloem sap and xylem sap fluxes through a pedicel can be considered to give useful information on mass accumulation into tomato fruits.