In:
Physiologia Plantarum, Wiley, Vol. 174, No. 6 ( 2022-11)
Abstract:
Photosynthetic induction, which is the response of the CO 2 assimilation rate to a stepwise increase in light intensity, potentially affects plant carbon gain and crop productivity in field environments. Although natural variations in photosynthetic induction are determined by CO 2 supply and its fixation, detailed factors, especially CO 2 supply, are unclear. This study investigated photosynthesis at steady and non‐steady states in three rice ( Oryza sativa L.) genotypes: ARC 11094, Takanari and Koshihikari. Stomatal traits and water relations in the plants were evaluated to characterise CO 2 supply. Photosynthetic induction in ARC 11094 and Takanari was superior to that in Koshihikari owing to an efficient CO 2 supply. The CO 2 supply in Takanari is attributed to its high stomatal density, small guard cell length and extensive root mass, whereas that in ARC 11094 is attributed to its high stomatal conductance per stoma and stomatal opening in leaves with insufficient water (i.e., anisohydric stomatal behaviour). Our results suggest that there are various mechanisms for realising an efficient CO 2 supply during the induction response. These characteristics can be useful for improving photosynthetic induction and, thus, crop productivity in field environments in future breeding programmes.
Type of Medium:
Online Resource
ISSN:
0031-9317
,
1399-3054
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
208872-1
detail.hit.zdb_id:
2020837-6
SSG:
12
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