TY - JOUR
T1 - Identification of large variation in the photosynthetic induction response among 37 soybean [Glycine max (L.) Merr.] genotypes that is not correlated with steady-state photosynthetic capacity
AU - Soleh, M. A.
AU - Tanaka, Y.
AU - Kim, S. Y.
AU - Huber, S. C.
AU - Sakoda, K.
AU - Shiraiwa, T.
N1 - Funding Information:
A part of this study was supported by SPIRITS (Supporting Program for Interaction-based Initiative Team Studies) at Kyoto University and the DIKTI scholarship; additional support was provided by USDA-ARS, and NIFA-AFRI (Grant 58-5012-5-025). We are grateful to Dr. Randall Nelson at the University of Illinois, Urbana-Champaign for providing the soybean seeds.
Publisher Copyright:
© 2016, Springer Science+Business Media Dordrecht.
PY - 2017/3/1
Y1 - 2017/3/1
N2 - Irradiance continuously fluctuates during the day in the field. The speed of the induction response of photosynthesis in high light affects the cumulative carbon gain of the plant and could impact growth and yield. The photosynthetic induction response and its relationship with the photosynthetic capacity under steady-state conditions (Pmax) were evaluated in 37 diverse soybean [Glycine max (L.) Merr.] genotypes. The induction response of leaf photosynthesis showed large variation among the soybean genotypes. After 5 min illumination with strong light, genotype NAM23 had the highest leaf photosynthetic rate of 33.8 µmol CO2 m−2 s−1, while genotype NAM12 showed the lowest rate at 4.7 µmol CO2 m−2 s−1. Cumulative CO2 fixation (CCF) during the first 5 min of high light exposure ranged from 5.5 mmol CO2 m−2 for NAM23 to 0.81 mmol CO2 m−2 for NAM12. The difference in the induction response among genotypes was consistent throughout the growth season. However, there was no significant correlation between CCF and Pmax among genotypes suggesting that different mechanisms regulate Pmax and the induction response. The observed variation in the induction response was mainly attributed to ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activation, but soybean lines differing in the induction response did not differ in the leaf content of Rubisco activase α- and β-proteins. Future studies will be focused on identifying molecular determinants of the photosynthetic induction response and determining whether this trait could be an important breeding target to achieve improved growth of soybeans in the field.
AB - Irradiance continuously fluctuates during the day in the field. The speed of the induction response of photosynthesis in high light affects the cumulative carbon gain of the plant and could impact growth and yield. The photosynthetic induction response and its relationship with the photosynthetic capacity under steady-state conditions (Pmax) were evaluated in 37 diverse soybean [Glycine max (L.) Merr.] genotypes. The induction response of leaf photosynthesis showed large variation among the soybean genotypes. After 5 min illumination with strong light, genotype NAM23 had the highest leaf photosynthetic rate of 33.8 µmol CO2 m−2 s−1, while genotype NAM12 showed the lowest rate at 4.7 µmol CO2 m−2 s−1. Cumulative CO2 fixation (CCF) during the first 5 min of high light exposure ranged from 5.5 mmol CO2 m−2 for NAM23 to 0.81 mmol CO2 m−2 for NAM12. The difference in the induction response among genotypes was consistent throughout the growth season. However, there was no significant correlation between CCF and Pmax among genotypes suggesting that different mechanisms regulate Pmax and the induction response. The observed variation in the induction response was mainly attributed to ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activation, but soybean lines differing in the induction response did not differ in the leaf content of Rubisco activase α- and β-proteins. Future studies will be focused on identifying molecular determinants of the photosynthetic induction response and determining whether this trait could be an important breeding target to achieve improved growth of soybeans in the field.
KW - Photosynthetic capacity
KW - Photosynthetic induction response
KW - Rubisco activase
KW - Soybean [Glycine max (L.) Merr.]
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U2 - 10.1007/s11120-016-0323-1
DO - 10.1007/s11120-016-0323-1
M3 - Article
C2 - 27878416
AN - SCOPUS:84996490546
VL - 131
SP - 305
EP - 315
JO - Photosynthesis Research
JF - Photosynthesis Research
SN - 0166-8595
IS - 3
ER -