Pollination studies and development of day neutral cultivars in strawberry (Fragaria x ananassaDuch.)
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Date
2016
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Publisher
YSPU
Abstract
The present investigation entitled “Pollination studies and development of day neutral cultivars in strawberry (Fragaria x ananassa Duch.) was carried out during 2011-12 and 2012-13 in the experimental field of Department of Fruit Science, Dr Y SParmar University of Horticulture and Forestry,
Nauni, Solan, Himachal Pradesh. In experiment 1,variability, correlation and path analysis were studied in
sixteen strawberry cultivars. ‘Chandler’ outperformed all other cultivars for vegetative characters such as
plant height, plant spread, number of leaves, leaf area, number of runners and number of fruits per plant.
Fruit size, weight and yield were maximum in cultivar Gorella.High coefficients of variability for total
yield, number of fruits per plant average berry weight and number of runners per plant may be used for
improvement through selection. Total yield showed both high heritability coupled with high genetic gain.Yield per plant was positively and significantly associated with plant height , plant spread, leaf
number per plant, leaf area, number of runners per plant, fruit length, fruit breadth, number of achenes per
fruit, number of fruits per plant, average berry weight.Plant spread had positive direct effect on yield /
plant in the first year and in second year for number of fruits / plant, number of runners / plant, leaf number, fruit breadth and fruit weight, days to maturity , number of achenes / fruit , TSS .In experimentII,
malformed fruit formation was improved by hand and cross pollination. In hand pollination ‘Fern’ and ‘Shasta’ had least malformed fruits. When hand pollinated,‘Pajaro’ x ‘Catskill’ and ‘Belrubi’ x ‘Douglas’ showed least malformed fruits. Maximum fruit set with better fruit size was from cross-pollination,
followed by hand and open pollination and least was in self-pollination.In experiment III, ethrel (500 ppm)
resulted in higher (86.67 %) germination followed by 200 ppm gibberellic acid (84.33 %).The line
‘Chandler’ exhibited good general combing ability for plant height , spread, leaf area, fruit size, number of
fruits per plant and TSS and ‘Sweet Charlie’ was good combiner for plant height, spread, fruit size, fruit
weight and TSS.Among the testers ‘Torrey’ showed good GCA for plant height, leaf number, leaf area,
fruit length, fruit weight and ‘Selva’ for leaf area, number of fruits per plant and TSS.Combining ability
depicted prominent role of non-additive gene action formost of the traits except plant height, fruit breadth
and TSS.Variability among the crosses was mainly due to higher contribution of lines compared to
individual contribution of testers and line x tester interaction.
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Keywords
fruits, developmental stages, strawberry (plant), planting, crossing over, germinability, confectionery, yields, biological phenomena, sets