Effect of 24-epibrassinolide on pollen viability during heat-stress in tomato.
Tomato pollen when treated with 24-epibrassinolide (EBR), it was observed that in vitro pollen germination was more tolerant to high temperature. A significantly higher in vitro pollen germination, enhanced tube growth and low pollen bursting were observed in presence of EBR at 35 degrees C. Since a preconditioning treatment of tomato plant was not required for these effects, it is concluded that EBR treatment increased basic thermotolerance of germinating pollen. This study provided the first evidence for EBR induced thermotolerance in germinating pollen.
Singh
Ishwar
I
Japan International Research Center for Agricultural Sciences, Okinawa Subtropical Station, Maezato 1091-1, Ishigaki, Okinawa 907-0002, Japan. singhishwar@eth.net
Shono
Mariko
M
D000222:Adaptation, Physiological / Q000187:drug effects; D060406:Brassinosteroids; D002777:Cholestanols / Q000494:pharmacology*; D018525:Germination / Q000187:drug effects*; D006358:Hot Temperature; D018551:Solanum lycopersicum / Q000187:drug effects* / Q000378:metabolism; D010937:Plant Growth Regulators / Q000494:pharmacology*; D011058:Pollen / Q000502:physiology*; D013260:Steroids, Heterocyclic / Q000494:pharmacology*
D060406:Brassinosteroids; D002777:Cholestanols; D010937:Plant Growth Regulators; D013260:Steroids, Heterocyclic; C023623:brassinolide