Comparison of susceptibility to photoinhibition and energy partitioning of absorbed light in photosystem II in flag leaves of two rice (Oryza sativa L.) cultivars that differ in their responses to Nitrogen-deficiency

Etsushi Kumagai, Takuya Araki, Ueno Osamu

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11 Citations (Scopus)

Abstract

The energy partitioning in photosystem II (PSII) and the susceptibility to photoinhibition in PSII were investigated in flag leaves of two rice cultivars, Shirobeniya (a traditional japonica) and Akenohoshi (an improved japonica-indica intermediate) grown under standard-nitrogen (N) (SN) and low-N (LN) conditions. N-deficiency resulted in significant decreases in total dry weight, net photosynthetic rate (PN), the energy flux via carboxylation (Jc), and content of ribulose-1,5- bisphosphate carboxylase/oxygenase (Rubisco) in flag leaves in the two cultivars, and these parameters of Shirobeniya were lower than those in Akenohoshi under the LN condition. In the two cultivars, the energy flux via alternative electron flow was significantly increased by N-deficiency, which was accompanied by enhanced activity of superoxide dismutase (SOD). Although under the LN condition no cultivar differences were found in Ja and SOD, ascorbate peroxidase activity in Shirobeniya was lower than that in Akenohoshi. N-deficiency resulted in more significant increases in the susceptibility to photoinhibition (the degree of decrease in maximum quantum yield of PSII), hydrogen peroxide (H2O2) content and malondialdehyde content after exposure to high irradiance in Shirobeniya than those in Akenohoshi. These results indicated that the increased susceptibility to photoinhibition in the LN plants of Shirobeniya was mainly due to oxidative damages to chloroplasts, resulting from lower carboxylation and H2O2-scavenging capacities. Therefore, both carboxylation and H2O2-scavenging capacities could be important factors in determining the cultivar difference in the productivity of rice under LN conditions.

Original languageEnglish
Pages (from-to)11-20
Number of pages10
JournalPlant Production Science
Volume13
Issue number1
DOIs
Publication statusPublished - Dec 14 2009

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photoinhibition
photosystem II
Oryza sativa
carboxylation
rice
energy
cultivars
nitrogen
leaves
superoxide dismutase
ribulose 1,5-diphosphate
oxygenases
ascorbate peroxidase
malondialdehyde
hydrogen peroxide
chloroplasts
electrons

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science

Cite this

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title = "Comparison of susceptibility to photoinhibition and energy partitioning of absorbed light in photosystem II in flag leaves of two rice (Oryza sativa L.) cultivars that differ in their responses to Nitrogen-deficiency",
abstract = "The energy partitioning in photosystem II (PSII) and the susceptibility to photoinhibition in PSII were investigated in flag leaves of two rice cultivars, Shirobeniya (a traditional japonica) and Akenohoshi (an improved japonica-indica intermediate) grown under standard-nitrogen (N) (SN) and low-N (LN) conditions. N-deficiency resulted in significant decreases in total dry weight, net photosynthetic rate (PN), the energy flux via carboxylation (Jc), and content of ribulose-1,5- bisphosphate carboxylase/oxygenase (Rubisco) in flag leaves in the two cultivars, and these parameters of Shirobeniya were lower than those in Akenohoshi under the LN condition. In the two cultivars, the energy flux via alternative electron flow was significantly increased by N-deficiency, which was accompanied by enhanced activity of superoxide dismutase (SOD). Although under the LN condition no cultivar differences were found in Ja and SOD, ascorbate peroxidase activity in Shirobeniya was lower than that in Akenohoshi. N-deficiency resulted in more significant increases in the susceptibility to photoinhibition (the degree of decrease in maximum quantum yield of PSII), hydrogen peroxide (H2O2) content and malondialdehyde content after exposure to high irradiance in Shirobeniya than those in Akenohoshi. These results indicated that the increased susceptibility to photoinhibition in the LN plants of Shirobeniya was mainly due to oxidative damages to chloroplasts, resulting from lower carboxylation and H2O2-scavenging capacities. Therefore, both carboxylation and H2O2-scavenging capacities could be important factors in determining the cultivar difference in the productivity of rice under LN conditions.",
author = "Etsushi Kumagai and Takuya Araki and Ueno Osamu",
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T1 - Comparison of susceptibility to photoinhibition and energy partitioning of absorbed light in photosystem II in flag leaves of two rice (Oryza sativa L.) cultivars that differ in their responses to Nitrogen-deficiency

AU - Kumagai, Etsushi

AU - Araki, Takuya

AU - Osamu, Ueno

PY - 2009/12/14

Y1 - 2009/12/14

N2 - The energy partitioning in photosystem II (PSII) and the susceptibility to photoinhibition in PSII were investigated in flag leaves of two rice cultivars, Shirobeniya (a traditional japonica) and Akenohoshi (an improved japonica-indica intermediate) grown under standard-nitrogen (N) (SN) and low-N (LN) conditions. N-deficiency resulted in significant decreases in total dry weight, net photosynthetic rate (PN), the energy flux via carboxylation (Jc), and content of ribulose-1,5- bisphosphate carboxylase/oxygenase (Rubisco) in flag leaves in the two cultivars, and these parameters of Shirobeniya were lower than those in Akenohoshi under the LN condition. In the two cultivars, the energy flux via alternative electron flow was significantly increased by N-deficiency, which was accompanied by enhanced activity of superoxide dismutase (SOD). Although under the LN condition no cultivar differences were found in Ja and SOD, ascorbate peroxidase activity in Shirobeniya was lower than that in Akenohoshi. N-deficiency resulted in more significant increases in the susceptibility to photoinhibition (the degree of decrease in maximum quantum yield of PSII), hydrogen peroxide (H2O2) content and malondialdehyde content after exposure to high irradiance in Shirobeniya than those in Akenohoshi. These results indicated that the increased susceptibility to photoinhibition in the LN plants of Shirobeniya was mainly due to oxidative damages to chloroplasts, resulting from lower carboxylation and H2O2-scavenging capacities. Therefore, both carboxylation and H2O2-scavenging capacities could be important factors in determining the cultivar difference in the productivity of rice under LN conditions.

AB - The energy partitioning in photosystem II (PSII) and the susceptibility to photoinhibition in PSII were investigated in flag leaves of two rice cultivars, Shirobeniya (a traditional japonica) and Akenohoshi (an improved japonica-indica intermediate) grown under standard-nitrogen (N) (SN) and low-N (LN) conditions. N-deficiency resulted in significant decreases in total dry weight, net photosynthetic rate (PN), the energy flux via carboxylation (Jc), and content of ribulose-1,5- bisphosphate carboxylase/oxygenase (Rubisco) in flag leaves in the two cultivars, and these parameters of Shirobeniya were lower than those in Akenohoshi under the LN condition. In the two cultivars, the energy flux via alternative electron flow was significantly increased by N-deficiency, which was accompanied by enhanced activity of superoxide dismutase (SOD). Although under the LN condition no cultivar differences were found in Ja and SOD, ascorbate peroxidase activity in Shirobeniya was lower than that in Akenohoshi. N-deficiency resulted in more significant increases in the susceptibility to photoinhibition (the degree of decrease in maximum quantum yield of PSII), hydrogen peroxide (H2O2) content and malondialdehyde content after exposure to high irradiance in Shirobeniya than those in Akenohoshi. These results indicated that the increased susceptibility to photoinhibition in the LN plants of Shirobeniya was mainly due to oxidative damages to chloroplasts, resulting from lower carboxylation and H2O2-scavenging capacities. Therefore, both carboxylation and H2O2-scavenging capacities could be important factors in determining the cultivar difference in the productivity of rice under LN conditions.

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