Effect of carbon dioxide and relative humidity on self incompatibility in cauliflower,Brassica oleracea |
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| Authors: | A Palloix Y Herve R B Knox C Dumas |
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| Institution: | (1) Département de Biologie Végétale, Université de Lyon 1, F-69622 Villeurbanne Cedex;(2) U.M. CNRS, 380 024, France;(3) INRA Station d'Amélioration des Plantes, Rennes, France;(4) Plant Cell Biology Research Centre, School of Botany, University of Melbourne, 3052 Parkville, Victoria, Australia;(5) Present address: Station d'Amélioration des Plantes Maraichères, INRA Centre de Recherches Agronomique d'Avignon, F-84140 Montfavet, France |
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| Abstract: | Summary The events of the progamic phase of fertilization have been monitored by in vitro experiments in self compatible (SC), partial
self-incompatible (PSI) and self incompatible (SI) lines. The duration of the progamic phase is about 30 h. Treatment with
low concentrations of CO2 (3 to 5%) at high relative humidity (rH, 100%) had the following effects: pollen quality, which declines normally during
flower ageing, was prematurely reduced; pollen adhesion and germination, both low in SI matings, were increased; the stigma
callose response in SI matings was reduced to the low level of SC matings; and the number of pollen tubes in the style after
SI matings significantly increased. CO2 concentrations of 4 to 6% applied for 8, 16 or 24 h at 100% rH proved to be the most effective treatment for blocking the
SI response in cauliflower. |
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| Keywords: | Carbon dioxide Relative humidity Brassica oleracea Pollen-pistil interactions Self compatibility |
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