ESTATE CROPS NEWS – Hermaphrodite character has been reported in physic nut, its role and contribution to production process especially to the yield has not been investigated. The objectives of this research were to evaluate hermaphrodite flowers contribution on yield and their mechanism inheritance. The evaluation was conducted at the Experimental Station of Balittri Sukabumi from May 2007 to July 2010. The spacing was 2 m x 2 m with 2,5 kg manure + 20 g Urea + 20 g SP 36 + 10 g KCl/plant. The experiment consisted of (1) evaluation of flower type of physic nut and (2) hermaphrodite inheritance and their contribution on yield.
Results of the experiment indicated eight from 60 physic nut genotypes were trimonoecious which were capable on producing male, female, and hermaphrodite flowers while as the rest (52 genotypes) were monoecious which produced only male and female flowers. The tri-monoecious were generally late flowering (120-274 days after planting) and low to medium yield (producing 23-228 fruits per plant in the first year). Hermaphrodite flowers generally occurred six months after planting at the amount ranged from 6,25-53% of total flowers.
Fruit set of inflorescences having hermaphrodite flowers was higher, average of 80% (ranged from 56-100%) than those with female and male flowers, average of 50% (ranged from 11-100%). Yield of physic nut was affected by the genetic potential of their parents rather than hermaphrodite character. Hermaphrodite flower character was inherited by both female and male parents and might be controlled by simple-dominant gene. (\RR. Sri Hartati, dan Sudarsono)
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