Variation of Abscisic Acid and Batatasin Content in Yam Bulbils—Effects of Stratification and Light Exposure

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Abstract
Batatasin content of yam (Dioscorea batatas Decne.) bulbils decreased slowly during 5 month stratification at 4°C, while it remained virtually unchanged when stored at 23°C. Abscisic acid increased considerably during the 1st month at 23°C but only slightly at 4°C and thereafter remained constant up to the end of the 5-month storage period. On transfer to sprouting beds at 23°C the batatasin content of stratified bulbils decreased sharply but that of non-stratified bulbils showed only slight variation. Light exposure during sprouting tests suppressed the sprouting of the non-stratified bulbils but promoted that of the stratified ones. The changes in batatasin contents were found when the bulbils were exposed to light and this is discussed in relation to sprouting responses to light. A scheme for batatasin economy in bulbil dormancy is proposed.

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