The present study was conducted to evaluate the genetic control of two mutations, induced by in vitro tissue culture, that affects the photosynthetic pigments content of sunflower. The genetic analysis indicated a monogenic control for both mutants, designed as chlorotica1 (chi1) and chlorotica2 (chi2). Reciprocal crosses revealed no maternal effect. In both mutants, the leaf contents of chlorophyll a (Chl a), Chl b, β-carotene, lutein, neoxanthin and violaxanthin were significantly reduced in comparison to normal leaves. By contrast, the zeaxanthin level and the de-epoxidation state (DEPS) displayed by the leaves of both mutants were higher with respect to wild-type, suggesting that in the mutants the energy adsorbed was higher than the capacity of photochemical quenching.
Genetic Characterization and Pigment Content of Two Chlorotica Mutants Isolated from in vitro Regenerated Plants of Sunflower (Helianthus annuus L.)
SALVINI, Mariangela;
2002
Abstract
The present study was conducted to evaluate the genetic control of two mutations, induced by in vitro tissue culture, that affects the photosynthetic pigments content of sunflower. The genetic analysis indicated a monogenic control for both mutants, designed as chlorotica1 (chi1) and chlorotica2 (chi2). Reciprocal crosses revealed no maternal effect. In both mutants, the leaf contents of chlorophyll a (Chl a), Chl b, β-carotene, lutein, neoxanthin and violaxanthin were significantly reduced in comparison to normal leaves. By contrast, the zeaxanthin level and the de-epoxidation state (DEPS) displayed by the leaves of both mutants were higher with respect to wild-type, suggesting that in the mutants the energy adsorbed was higher than the capacity of photochemical quenching.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
