Vol. 76 No: 3

Title:
Fate of photosynthates from spur leaves of 'Nijisseiki' pear during the period of rapid fruit growth

Authors:
YUANWEN TENG, K. TANABEE, F. TAMURA and A. OHMAE

pp: 300-304

Abstract:
Spurs of 'Nijisseiki' pear (Pyrus pyriflora Nakai) were allowed to assimilate ¹³CO₂ at 87 d after anthesis (DAA) and at 108 DAA during the period of rapid fruit growth. Then the spurs were sampled periodically until fruit harvest time to trace the time course and amount of movement of assimilates from spur leaves to individual organs in the spur. The amount of ¹³C absorbed by fruit within 3 d after labelling was constant until harvest, regardless of the labelling date. However, the total amount of ¹³C in the spur decreased continually until harvest. Of the total amount of ¹³C recovered in the spur labelled at 87 DAA, by harvest, 43.2% of ¹³C was found in the fruit flesh (cortex of receptacle), 5% in the core (pith of receptacle 1 pericarp 1 seeds), 5.6% in spur stem, 5.4% in the source leaves, and 40.8% was respired and exported from the spur. Of total amount of initial 13 C labelled at 108 DAA, at harvest, the proportion of ¹³C translocated to flesh, core, stem, respired, and remaining in leaves was 61%, 6.1%, 3.0%, 24% and 5.4%, respectively. Photosynthates fixed by the spur early in the rapid growth stage of the fruit contribute more to them formation of starch and structural materials and less to soluble carbohydrates in fruit than do those fixed later.

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