ISHS Acta Horticulturae 696: VII International Symposium on Temperate Zone Fruits in the Tropics and Subtropics - Part Two
EXPLOITATION OF SUB-TEMPERATE POMEGRANATE DARU IN BREEDING TROPICAL VARIETIES |
| Authors: | S.H. Jalikop, R.D. Rawal, R. Kumar |
| Keywords: | bacterial nodal blight, Punica granatum, fruit characteristics |
| Abstract:
Daru was employed in breeding tropical anardana variety and disease resistance as it exhibited high level of acidity and field tolerance for bacterial nodal blight (BNB), a disease that has threatened cultivation of pomegranate in tropics and subtropics. In order to achieve these objectives, Daru was crossed with Ganesh (C1) and F1 of Ganesh × Nana (C2) and Ganesh × Kabul Yellow (C3). Morphologically, most of the hybrids were close to Daru indicating dominant nature of plant and fruit attributes. All the progenies from 3 crosses had a maximum fruit acidity of C1=5.66 %; C2=9.51% and C3=4.86%, thick skin (0.36-0.45 mm), moderate to small size fruits and hard seeds suggesting again predominance of traits of temperate type. Very high fruit acidity recorded in Ganesh × Kabul Yellow (sweet × sweet) and C2 i.e., (Ganesh × Nana) × Daru (sour × sour) might be due to epistatic effects or linked dominant rather than overdominance. However, high-acidity was always dominant to low acidity, pink aril colour to white and hard seeded nature to soft. Parents and hybrids were also scored for reaction to BNB on a 0-5 scale. The high level of resistance exhibited by C2 hybrids with a mean score of 0.38 in contrast to >4.25 recorded in the progeny of several other multiple crosses indicated that Daru is an excellent source for BNB resistance. Recessive genes controlled the resistance of Daru while that of Nana by incompletely dominant genes. | |
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