Overcoming Incompatibility in Brassica campestris L. by Carbon Dioxide, and Dark Fixation of the Gas by Self- and Cross-pollinated Pistils |
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Authors: | DHALIWAL A S; MALIK C P; SINGH M B |
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Institution: | Department of Botany, Punjab Agricultural University Ludhiana, India |
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Abstract: | Supplementing pollen suspension cultures with CO2 (35per cent) caused a marked increase in germination and tube growthin vitro in Brassica campestris L. cv. toria. A weakening ofself-incompatibility by increased CO2 levels from 35per cent was observed. The percentage of pollen tubes whichpenetrated the cuticle layer of stigmatic papilla cells in self-pollinatedpistils was high when CO2 level was 5 per cent. Phosphoenolpyruvate (PEP) carboxylase activity was greater in the pollengerminated in 4 per cent CO2 as compared to air (0.03 per cent).A possible role of CO2 for self-recognition and control of pollentube growth is proposed, proposed. Brassica campestris L., carbon dioxide, self-incompatibility, phosphoenol pyruvate carboxylase |
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