Quantitative changes of batatasins and abscisic acid in relation to the development of dormancy in yam bulbils

概要

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As yam bulbils (Dioscorea batatas Decne.) grow on the mother plants, dormancy of the bulbils develops gradually. This is evidenced by the fact that the sproutability of bulbils decreased in proportion to their sizes, 2~ mm to 8-12 mm in diameter when bulbils are detached and sown in Petri dishes. This decreasing sproutability was seen until the stratification at 5℃ for dormancy release was completed. During the growth process of attached bulbils, the contents of batatasins I and II increased markedly per surface area and per bulbil although on a fresh weight basis they remained constant. The increases of batatasin III and abscisic acid (ABA) were more striking and were evident in all comparisons. These results corresponded to different localization of batatasins and ABA in bulbil tissues. All of 3 batatasins were localized in the outermost layers of the bulbils, whereas ABA was distributed evenly throughout their tissues. These results suggest different roles for batatasins and ABA in the regulation of yam bulbil dormancy.
日本植物生理学会の論文