Contributions of cryptochromes and phototropins to stomatal opening through the day.

摘要: The UV-A/blue photoreceptors phototropins and cryptochromes are both known to contribute stomatal opening (Δgs) in blue light. However, their relative contributions the maintenance of gs light through whole photoperiod remain unknown. To elucidate this question, Arabidopsis phot1 phot2 cry1 cry2 mutants (MTs) respective wild types (WTs) were irradiated with 200 μmolm-2s-1 blue-, green- or red-light (BL, GL RL) throughout a 11-h photoperiod. Stomatal conductance (gs) was higher under BL than RL GL. Under RL, not affected by either photoreceptor mutations, but slightly lower its WT. BL, presence essential for rapid at beginning photoperiod, maximal beyond 3 h irradiation required cryptochromes. Time courses whole-plant net carbon assimilation rate (Anet) effective quantum yield PSII photochemistry (ΦPSII) consistent an Anet-independent contribution on mutants. changing roles day may allow more flexible coordination between Anet.