0290919980
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  • AID0290919980
  • DOI10.1093/oxfordjournals.aob.a088329
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Article

Effects of High Temperature Stress on Brassica Pollen: Viability, Germination and Ability to Set Fruits and Seeds

Rao G.U.
1
Rao G.U.
Scientists

, , Shivanna K.R.
5
Shivanna K.R.
Scientists

Annals of Botany
527
Annals of Botany
Журнал с антэкологическими публикациями.
Oxford University Press · office@annbot.com

, 1992. V. 69. No. 3. P. 193–198
Pollen grains of Brassica juncea (L) Czern. were exposed to high temperature (45, 60 and 75°C, for 4–24 h) and their viability [using the fluorochromatic reaction (FCR) test], germination, and ability to set fruits and seeds were investigated. High temperature up to 60°C did not affect pollen viability; these pollen samples germinated on the stigma and produced fruits and seeds. There was no correlation between viability and seed set in pollen samples exposed to 75°C; they showed only about 25% reduction in viability but failed to germinate on the stigma and, consequently, to set seeds. However, these pollen samples induced parthenocarpy. A clear relationship between viability and seed-set was observed when the extent of retention of fluorescence in pollen over a 2-h period was used to assess viability. The fluorescence was retained even after 2 h in pollen samples which induced seed-set, while in those which failed to induce seed-set the fluorescence was lost in about 60 min due to the leakage of fluorescein. Thus, in stressed pollen, the extent of retention of fluorescence may give a better indication of pollen function than initial fluorescence, as is being done routinely in FCR test.

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