Effects of water stress on leaf water potential, flowering, carbohydrate content and ABA content in 'Meiwa' kumquat [Fortunella] trees
2010
Ono, T., Meiji Univ., Kawasaki, Kanagawa (Japan) | Hagiwara, H. | Iwasaki, N.
'Meiwa' kumquat (Fortunella crassifolia Swingle) trees were subjected to water stress in order to increase first-flush flowers by withholding water until the soil water content reached about 30% and was maintained for 10 or 20 days. The water potential of the leaf decreased only after 20 days of water stress. Twenty days of water stress increased first-flush flowers compared with that in non-treated control trees. The ABA level increased in the leaves and the roots subjected to 10 and 20 days of water stress. Total sugars in the root increased trees undergoing 10 or 20 days of water stress, while those in the leaf and shoot tended to increase only after 20 days of water stress. However, starch contents of the leaf and shoot tended to decrease in water-stressed trees. These findings indicate that increase in total sugars in the root and a continuous high ABA level under water stress after termination of new shoot growth significantly increases the number of first-flush flowers.
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