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Understanding Physiology and Impacts of High Temperature Stress on the Progamic Phase of Coconut (Cocos nucifera L.)

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Title Understanding Physiology and Impacts of High Temperature Stress on the Progamic Phase of Coconut (Cocos nucifera L.)
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Creator Hebbar K.B., Neethu P., Sukumar P.A., Sujithra M., Santhosh A., Ramesh S.V., Niral V., Hareesh G.S, Nameer P.O., P.V.V. Prasad
 
Subject coconut; climate change; high temperature; pollen tube growth; progamic phase; stigma receptivity
 
Description Not Available
The reproductive phase of coconut is extremely sensitive to high temperature, manifesting
as button (female flower) shedding and poor nut set. The progamic phase, which elapses from
pollination to fertilization, is one of the most critical phases during the sexual reproduction processes
in annuals and fruit trees and is extremely vulnerable to high temperature. Hence, we investigated the
progamic phase of the tall coconut cultivar West Coast Tall (WCT) and the e ect of high temperature
on the phase under both in vivo and in vitro conditions. Coconut has a long pistil and its length was
found to be 18.2 4.9 mm in WCT. Pollen germination on stigma occurred one day after pollination
and the pollen tube traversed through the pistil and reached micropyle of ovule four days after
pollination at 29 C. However, high temperature (Tmax > 33 C), both under in vivo and in vitro
conditions, significantly reduced pollen tube growth through the pistil, suggesting its inability to
reach the ovule on time to e ect fertilization. High temperature also advanced nectar secretion and
stigma receptivity and the receptive stigma was dry without nectar, rendering it unappealing to
insect pollinators. Thus, both poor pollination and the inability of pollen tube to reach the ovule on
time to e ect fertilization could be the cause of poor nut set in the coconut variety WCT under high
temperature. However, it was encouraging to note that the pollen tube growth was less vulnerable
to elevated temperature under high humidity, suggesting that climate change e ect on coconut in
coastal regions with high humidity might be less severe.
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Date 2021-07-30T04:54:39Z
2021-07-30T04:54:39Z
2020-11-26
 
Type Article
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/51355
 
Language English
 
Relation Not Available;
 
Publisher Not Available