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Differences in in vitro pollen germination and pollen tube growth of coconut (Cocos nucifera L.) cultivars in response to high temperature stress.

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Title Differences in in vitro pollen germination and pollen tube growth of coconut (Cocos nucifera L.) cultivars in response to high temperature stress.
Not Available
 
Creator Hebbar KB, Helan MR, Anusree RN, Kannan S, Niral V, Arivalagan M, Gupta A, Samsudeen K, Chandran KP, Chowdappa P, and Vara Prasad P.V.
 
Subject Pollen Germination
 
Description Not Available
Temperature is a primary factor affecting the rate of plant development. Warmer temperatures expected with
climate change and the potential for more extreme temperature events will impact plant productivity.
Pollination is one of the most sensitive phenological stages to temperature extremes and in this study an in vitro
pollen germination technique is used to screen coconut genotypes tolerant to high temperature. The pollen of
twelve coconut genotypes comprising five talls (CCNT, FMST, LCT, PHOT and WCT), five dwarfs (CGD, COD,
CRD, GBGD and MYD) and two hybrids (COD X WCT and MYD X WCT) were screened at different temperature
levels from 10 to 50 °C at an interval of 2.5 °C. Cultivar variation existed for cardinal temperatures (Tmin, Topt and
Tmax) of pollen germination percentage and pollen tube growth. Mean cardinal temperatures calculated from the
bilinear model for the 12 genotypes ranged from 23.5 °C to 29.5 °C, 9.7 °C to 16.5 °C and 40.1 °C to 43.9 °C for
Topt, Tmin and Tmax, respectively. In general tall, cultivars FMST, LCT, WCT, dwarf cultivar COD and hybrids
showed better adaptability to high temperature while dwarf MYD was the least adaptable. At the metabolic level,
high temperatures induced about 20% reduction in soluble protein content compared to optimal temperature in
all the studied genotypes. There was an inverse relationship between superoxide dismutase activity and pollen
germination percentage. Overall, there was wide variation in coconut cultivars for cardinal temperatures (Tmin,
Topt and Tmax) of pollen germination percentage and pollen tube growth. The genotypes with higher Tmax for
pollen germination and tube growth may be more tolerant to high temperature stress during flowering. Further
studies are required to validate the results under in vivo condition; and also to understand the mechanism and
factors that lead to pollen sterility in coconut.
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Date 2019-02-20T06:49:10Z
2019-02-20T06:49:10Z
2018-04-01
 
Type Journal
 
Identifier Hebbar KB, Helan MR, Anusree RN, Kannan S, Niral V, Arivalagan M, Gupta A, Samsudeen K, Chandran KP, Chowdappa P, and Vara Prasad P.V. (2018). Differences in in vitro pollen germination and pollen tube growth of coconut (Cocos nucifera L.) cultivars in response to high temperature stress. Environmental and Experimental Botany, 153: 35–44.
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/17027
 
Language English
 
Relation Not Available;
 
Publisher Elsevier