Environmental Control in Biology
Online ISSN : 1883-0986
Print ISSN : 1880-554X
ISSN-L : 1880-554X
Original Paper
Relationships between the Number of First-Flush Flowers and Leaf Water Potential or Leaf ABA Content Affected by Varying Degrees of Water Stress in Meiwa Kumquat (Fortunella crassifolia Swingle)
Naoto IWASAKIYuuki NAKANOKaori SUZUKIAdumi MOCHIZUKI
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ジャーナル フリー

2017 年 55 巻 2 号 p. 59-64

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The effect of water stress on the number of first-flush flowers was investigated in Meiwa kumquat trees. Treatments of soil water deficit (SWD), soil water deficit combined with mist (SWM), and non-treated controls (CONT) were established in a greenhouse in 2009 and 2010. The leaf water potential in SWD and SWM decreased significantly after 10 d of the treatment. In 2009, the number of first-flush flowers in SWD and SWM was 133.8 and 142.4, respectively, and these were significantly greater than that in CONT. Second- or third-flush flowers were significantly greater in CONT. In 2010, the number of first-flush flowers increased with a decrease in the leaf water potential down to −1.7 MPa. It was also positively correlated with leaf abscisic acid (ABA) content, but did not significantly change once ABA levels exceeded 5 nmol g−1. These results suggest that water stress increases the number of first-flush flowers. The severe water stress represented by leaf water potentials below −1.7 MPa, or over 5 nmol g−1 of leaf ABA content, did not appear to have the same effect. Approximately 150 flowers per 100 nodes of shoots appeared to be the maximum number of first-flush flowers produced by Meiwa kumquat trees.

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© 2017 Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists
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