The Effect on Net Photosynthesis of Pedigree Selection for Low and High Rates of Photorespiration in Tobacco
AUTOR(ES)
Zelitch, Israel
RESUMO
A normal appearing plant with a low rate of photorespiration (ratio of 14CO2 released light/dark = 1.6) was found in an unselected tobacco (Nicotiana tabacum) cultivar. The plant was self-pollinated, and further selections were made on several successive generations. Excised leaves from the progeny of the selections were examined for photorespiration and net CO2 assimilation in normal air during photosynthesis. Similar measurements were made of plants derived from selfed parents with high rates of photorespiration (ratio of 14CO2 released light/dark = 3.0 or greater). Efficient photosynthetic plants (greater than 22.0 mg of CO2 dm−2 hr−1) with low rates of photorespiration produced a larger proportion of efficient progeny (about 25%) than did selfing inefficient plants (about 6%), but this proportion did not increase in successive generations.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=366433Documentos Relacionados
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