低低温要求性 ‘オキナワ’ の台木利用がモモ ‘日川白鳳’ の開花に及ぼす影響

Abstract

Global warming is making it difficult to achieve the chilling requirement for the completion of endodormancy in protected peach cultivation. To stabilize peach production in the face of warming winters, we examined the use of rootstock low-chilling 'Okinawa' and endodormancy-breaking treatments. In pot culture, 'Hikawahakuhou' on 'Okinawa' rooted and flowered earlier than 'Hikawahakuhou' on 'Ohatsumomo'. Therefore, it was suggested that rootstock low-chilling 'Okinawa' influences the flowering of 'Hikawahakuhou'. In field culture, 'Hikawahakuhou' on 'Okinawa' led to commercial fruit quality and growth. In the field with 'Hikawahakuhou' on 'Okinawa', the application of either of two endodormancy-breaking treatments, hydrogen cyanamide sprayed after 400 to 600 chilling hours or nitrogen metabolism solution sprayed after 600 to 800 chilling hours, advanced both flowering and harvesting dates. Under continued global warming, the use of 'Okinawa' as a rootstock and endodormancy-breaking treatments will enable continued production of peach.

Prediction of Developmental Changes due to Climate Change in ‘Delaware’ Grapes in Osaka, Japan, based on Simulated Data

“…The geographical distribution of the full-flowering date of 'Delaware' grapes in the study areas is shown in Figure 9. In 1981-1990, the percentage of grid cells at 146-150 DOY was the highest at 53.7% Furthermore, low-chilling table grape cultivars must be evaluated or bred to prepare for inadequate chilling hours in 'Delaware' grapes, similar to the evaluation of low-chilling 'Okinawa' in peach (Matsumoto et al 2019).…”