CHARACTERIZATION OF GENETIC DIVERSITY AND POLLINATION STUDIES IN SEEDLING POPULATION OF PECAN [Carya illinoensis (WANG) K.KOCH]
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Date
2019-02
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UHF,NAUNI
Abstract
ABSTRACT
The present investigation entitled “Characterization of genetic diversity and pollination
, in seedling population of pecan [Carya illinoensis (Wang) K.Koch]” was carried out at the
Experimental Orchard, Kalaghat Department of Fruit Science, Dr YSPUHF Nauni Solan (HP) during
2015-2017, aimed to assess the nature and magnitude of variability in seedling population so as to
identify compatible genotypes to enhance pecan productivity. The plant growth, foliage, floral, nut
and kernel characteristics were determined to characterize the genetic diversity in 70 trees of seedling
origin while fruit set, fruit retention and various nut, kernel characters under different modes of
pollination were studied. The seedling population exhibited variation in plant growth i.e. upright,semi
upright and spreading, branching density was also variable so was the yield potential and STN 39 had
highest trunk diameter . Nut yield varied from 0.56 to 13.36 kg/tree. Variation was also observed for
leaflet number, time of leaf bud burst, leaf fall, leaf shape, time of leaf shedding, stigma receptivity.
Most seedlings were protandrous. Maturation of nut extended from 4th September to 29th September.
STN 35 had higher nut weight (10.58 g), width, kernel weight (7.40 g), whereas, STN 61 had higher
nut length (45.54 mm). Minimum shell thickness (0.25 mm) was in STN 20 and maximum kernel
recovery was in STN 7 (87.92 %). Based upon evaluation studies, 8 genotypes were identified as
promising for various nut and kernel characteristics. Pollination studies indicated that cross STN
61×PS2 had highest fruit set, retention, nut and kernel weight, nut and kernel length whereas cross
STN 63×PS3 had highest kernel recovery, nut and kernel width as well as highest fat content. Mean
fruit set and retention were highest in open pollinated trees and so was nut, kernel weight, kernel
recovery than in hand self pollination. Nut yield was positively correlated with nut and kernel weight,
length, showed inverse relationship with protein. High heritability for kernel recovery, fat content and
nut length suggested selection could be effective for these characters.
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