The Contribution of Photosynthesis to the Red Light Response of Stomatal Conductance
Overview
Affiliations
To determine the contribution of photosynthesis on stomatal conductance, we contrasted the stomatal red light response of wild-type tobacco (Nicotiana tabacum 'W38') with that of plants impaired in photosynthesis by antisense reductions in the content of either cytochrome b(6)f complex (anti-b/f plants) or Rubisco (anti-SSU plants). Both transgenic genotypes showed a lowered content of the antisense target proteins in guard cells as well as in the mesophyll. In the anti-b/f plants, CO(2) assimilation rates were proportional to leaf cytochrome b(6)f content, but there was little effect on stomatal conductance and the rate of stomatal opening. To compare the relationship between photosynthesis and stomatal conductance, wild-type plants and anti-SSU plants were grown at 30 and 300 micromol photon m(-2) s(-1) irradiance (low light and medium light [ML], respectively). Growth in ML increased CO(2) assimilation rates and stomatal conductance in both genotypes. Despite the significantly lower CO(2) assimilation rate in the anti-SSU plants, the differences in stomatal conductance between the genotypes were nonsignificant at either growth irradiance. Irrespective of plant genotype, stomatal density in the two leaf surfaces was 2-fold higher in ML-grown plants than in low-light-grown plants and conductance normalized to stomatal density was unaffected by growth irradiance. We conclude that the red light response of stomatal conductance is independent of the concurrent photosynthetic rate of the guard cells or of that of the underlying mesophyll. Furthermore, we suggest that the correlation of photosynthetic capacity and stomatal conductance observed under different light environments is caused by signals largely independent of photosynthesis.
Physiological Responses of spp. to the Presence of High Aluminum Availability in the Soil.
Dos Santos B, Ferreira T, Olivio M, de Souza L, de Camargos L Plants (Basel). 2024; 13(16).
PMID: 39204729 PMC: 11359568. DOI: 10.3390/plants13162292.
Lv Y, Gu L, Man R, Liu X, Xu J Front Plant Sci. 2024; 15:1397948.
PMID: 39148618 PMC: 11324428. DOI: 10.3389/fpls.2024.1397948.
Multiplexed CRISPR-Cas9 mutagenesis of rice noncoding sequences for transgene-free overexpression.
Patel-Tupper D, Kelikian A, Leipertz A, Maryn N, Tjahjadi M, Karavolias N Sci Adv. 2024; 10(23):eadm7452.
PMID: 38848363 PMC: 11160471. DOI: 10.1126/sciadv.adm7452.
Soufi H, Roosta H, Hamidpour M Sci Rep. 2023; 13(1):20766.
PMID: 38007543 PMC: 10676428. DOI: 10.1038/s41598-023-48284-1.
Morphological and Physiological Responses of Hybrid Aspen ( Michx. × L.) Clones to Light .
Kondratovics T, Zeps M, Rupeika D, Zeltins P, Gailis A, Matisons R Plants (Basel). 2022; 11(20).
PMID: 36297714 PMC: 9607416. DOI: 10.3390/plants11202692.