STUDIES ON POLLEN VIABILITY AND COMPATIBILITY IN JASMINUM SPP.
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Date
2017-09
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University of Horticultural Sciences, Bagalkot. (College of Horticulture, Bengaluru).
Abstract
The investigations on pollen viability and compatibility in Jasminum spp. was carried out
during 2016-17 at ICAR-IIHR, Bengaluru. Six species i.e. Jasminum sambac, J. auriculatum, J.
grandiflorum, J. malabaricum, J. multiflorum, and J. flexile were used in this study. The results
revealed that anther dehiscence started before anthesis in all the six species. Stigma was
receptive 12 hours prior to anthesis and peak was observed at the time of anthesis except J.
multiflorum while it was 12 hours after anthesis. J. malabaricum exhibited highest percentage of
pollen viability (96.57%) and germination (91.58%) than other species, followed by J. flexile
(84.92% and 81.86%) and J. auriculatum (71.32% and 71.08%) under in vitro condition. The
species J. sambac recorded the lowest pollen viability (34.27%) and germination (34.09%). J.
malabaricum exhibited maximum pollen germination (91.58%) in modified Brewbaker and
Kwacks medium (100ppm H3BO3 + 300ppm Ca(No3)2 + 200ppm MgSO4) supplemented with
10% sucrose and 15% Polyethylene glycol. Highest percentages of normal shaped pollen grains
were observed in J. auriculatum (96.93%) and J. malabaricum (96.89%). No fruit setting was
observed in J. sambac when used as both male and female parent. Highest seed set was observed
in open pollination in all the species studied compared to self-pollination and artificial cross
pollination. Fruits were aborted in many crosses before entering into matured stage. Compared to
other species, seed set and high degree of cross compatibility was observed in the crosses
involving J. auriculatum with J. grandiflorum, J. malabaricum and J. malabaricum with J.
flexile and also its reciprocal crosses. This information gathered on pollen viability, stigma
receptivity, compatibility and seed set in different mode of pollination would help the breeders in
further crop improvement in Jasminum species.