Abstract
| Original language | English |
|---|---|
| Journal | Functional Plant Biology |
| ISSN | 1445-4408 |
| Publication status | Accepted/In press - 19 Oct 2019 |
| MoE publication type | A1 Journal article-refereed |
Cite this
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Contributions of cryptochromes and phototropins to stomatal opening through the day. / Wang, Fang; Robson, T Matthew; Casal, Jorge J; Aphalo, Pedro J.
In: Functional Plant Biology, 19.10.2019.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Contributions of cryptochromes and phototropins to stomatal opening through the day
AU - Wang, Fang
AU - Robson, T Matthew
AU - Casal, Jorge J
AU - Aphalo, Pedro J.
PY - 2019/10/19
Y1 - 2019/10/19
N2 - The UV-A/blue photoreceptors phototropins and cryptochromes are both known to contribute to stomatal opening (∆gs) in blue light. However, their relative contributions to maintenance of gs in blue light through the whole photoperiod remains unknown. To elucidate this question, Arabidopsis phot1 phot2 and cry1 cry2 mutants (MTs) and their respective wild types (WTs) were irradiated with 200 μmol m-2 s-1 of blue-, green- or red-light (BL, GL or RL) throughout a 11-hour photoperiod. Stomatal conductance (gs) was higher under BL, than under RL or GL. Under RL, gs was not affected by either of the photoreceptor mutations, but under GL gs was slightly lower in cry1 cry2 than its WT. Under BL, the presence of phototropins was essential for rapid stomatal opening at the beginning of the photoperiod, while maximal stomatal opening beyond 3 h of irradiation required both phototropins and cryptochromes. Time courses of whole-plant net carbon assimilation rate (Anet) and the effective quantum yield of photosystem II photochemistry (ΦPSII) were consistent with an Anet-independent contribution of BL on gs both in phot1 phot2 and cry1 cry2 mutants. The changing roles of phototropins and cryptochromes through the day may allow more flexible coordination between gs and Anet.
AB - The UV-A/blue photoreceptors phototropins and cryptochromes are both known to contribute to stomatal opening (∆gs) in blue light. However, their relative contributions to maintenance of gs in blue light through the whole photoperiod remains unknown. To elucidate this question, Arabidopsis phot1 phot2 and cry1 cry2 mutants (MTs) and their respective wild types (WTs) were irradiated with 200 μmol m-2 s-1 of blue-, green- or red-light (BL, GL or RL) throughout a 11-hour photoperiod. Stomatal conductance (gs) was higher under BL, than under RL or GL. Under RL, gs was not affected by either of the photoreceptor mutations, but under GL gs was slightly lower in cry1 cry2 than its WT. Under BL, the presence of phototropins was essential for rapid stomatal opening at the beginning of the photoperiod, while maximal stomatal opening beyond 3 h of irradiation required both phototropins and cryptochromes. Time courses of whole-plant net carbon assimilation rate (Anet) and the effective quantum yield of photosystem II photochemistry (ΦPSII) were consistent with an Anet-independent contribution of BL on gs both in phot1 phot2 and cry1 cry2 mutants. The changing roles of phototropins and cryptochromes through the day may allow more flexible coordination between gs and Anet.
UR - http://www.publish.csiro.au/FP/justaccepted/FP19053
M3 - Article
JO - Functional Plant Biology
JF - Functional Plant Biology
SN - 1445-4408
ER -