Promotion of Ca accumulation in inner leaves by air supply for prevention of lettuce tipburn
Promotion of Ca accumulation in inner leaves by air supply for prevention of lettuce tipburn
复制标题
送风促进叶内钙积累，预防生菜烧伤
DOI：
10.13031/2013.28645
复制
发表时间：
1992
影响因子：
1.5
通讯作者：
T. Takakura
中科院分区：
文献类型：
--
作者：
E. Goto;T. Takakura
采用45 Ca示踪法测定了生菜叶片中Ca的积累量，研究了通气对生菜叶片内叶的影响。Letterium在生长箱中暴露于各种条件的蒸汽压赤字（VPD），空气供应的流速，和空气供应的处理时间。空气被吹到生长点周围的内部发育的叶子上。在光照期不通风条件下，7-10 cm长的外叶Ca积累量随室内空气VPD的增加而增加，而1-3 cm长的内叶Ca积累量不受室内空气VPD的影响，且极低。当空气流量为160 mL/min时，叶片内钙积累量比对照增加4.6倍。在黑暗期，通入空气后，内外叶钙积累量均增加。空气供应被证明是通过增加内叶中Ca的积累来防止烧尖的，因为它增加了内叶周围空气中的VPD，促进了叶片的蒸腾作用，从而促进了Ca从根到内叶的吸收。
The Ca accumulation in the leaves of lettuce was determined by 45Ca tracer measurements to study the effect of air supply to the inner leaves which were susceptible to tipburn, a Ca-related physiological disorder. Lettuce was exposed in a growth cabinet to various conditions of vapor pressure deficit (VPD), flow rate of air supply, and treatment time of air supply. Air was blown onto the inner developing leaves around a growing point. Without air supply in the light period, Ca accumulation in the outer leaves 7-10 cm in length increased with the increase in VPD in the cabinet air, while that in the inner leaves 1-3 cm long was not affected by VPD in the cabinet air and was extremely low. When air was supplied at a flow rate of 160 mL/min, Ca accumulation in the inner leaves was increased 4.6 times over that in the control. In the dark period, Ca accumulation increased in both the inner and the outer leaves when air was supplied. Air supply was shown to prevent tipburn by increasing Ca accumulation in the inner leaves, because it increased VPD in the air around the inner leaves, encouraged transpiration from the leaves, and consequently promoted Ca uptake from the root to the inner leaves.