J.of Soc of Agri Struc, Japan.
Vol.31,No.3 December 2000, 145-152
Original:
Language: English

    In order to understand a mechanism regulating sugar accumulation in peach fruit under water stress condidon, ¹³C-photoassimilates partidoning to fruit and the other organs in container-grown peach trees were examined under water stress condition during fruit maturation stage.
    Under moderate water stress condidon [P_max(predawn leaf water potential): -0.85 MPa], ¹³C content per unit dry matter, corresponding to sink activity for photoassimilates, increased in fruit, although photosynthedc rate decreased to 83%. On the other hand, under severer water stress condition (P_max: -1.65 MPa), both the photosynthetic rate and the photoassimilates partidoning to fruit were decreased. These results suggest that photoassimilate pardtioning to fruit are accelerated under moderate water stress condition, although the severe water stress exerts an opposite effect.

Keywords: peach, container-planted cultivation, water stress, photoassimilates partitioning, photosynthesis

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