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Nuclear mutation xantha1 (xan1) arose spontaneously in sunflower and it appeared to have many pleiotropic effects. Homozygous xan1/xan1 seedlings, in field conditions, die after depletion of cotyledonary reserves and can be only recovered by selfing normal heterozygous plants (XAN1/xan1). xan1 mutant showed aberrant development of chloroplasts, deficient pigment content and reduced CO 2 assimilation...
The effect of fumigation of sunflower plants with 150 nl L −1 of ozone (4h a day for 4 days) on photosynthetic electron transfer and thylakoid polypeptide pattern has been studied. Ozone affects both PSI and PSII. By immunoblotting analysis, a loss of steady state level of the PSII reaction centre D1 protein was observed, the extent of which was comparable with the loss of electron transfer...
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