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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front Agric Chin    2009, Vol. 3 Issue (3) : 266-273     DOI: 10.1007/s11703-009-0063-5
Effects of mannitol induced osmotic stress on proline accumulation, pigment degradation, photosynthetic abilities and growth characters in C3 rice and C4 sorghum
Suriyan CHA-UM1(), Souvanh THADAVONG2, Chalermpol KIRDMANEE1
1. National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Klong Laung 12120, Thailand; 2. Agriculture Research Center, National Agriculture and Forestry Research Institute, Vientiane, Laos
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Osmotic stress is one of the most important abiotic factors which inhibit growth and development in both the vegetative and reproductive stages of many plant species. The aim of this investigation was to compare the biochemical and physiological responses in C3 rice and C4 sorghum to water deficit. Chlorophyll a (Chla), chlorophyll b (Chlb), total chlorophyll (TC) and total carotenoid (Cx+c) contents in both rice and sorghum seedlings under osmotic stress were adversely affected, related to increasing osmotic pressure in the culture media. In addition, the chlorophyll’s fluorescence parameters and net photosynthetic rate (Pn) decreased, leading to growth reduction. Also, a positive correlation was found between physiological and biochemical data, while proline accumulation showed a negative relationship. The Chlb, Pn and fresh weight were maintained better in osmotic-stressed (-1.205 MPa) C4 sorghum seedlings than those in C3 rice seedlings. The growth and physiological responses of C3 rice and C4 sorghum decreased depending on the plant species, the osmotic pressure in the media and their interactions. Pigment content and Pn ability in C4 sorghum grown under mannitol-induced osmotic stress increased to a greater degree than in C3 rice, resulting in maintenance of growth.

Keywords chlorophyll a fluorescence      net photosynthetic rate      Oryza sativa L.      pigment degradation      Sorghum bicolor (L.) M?ench      water deficit stress     
Corresponding Authors: CHA-UM Suriyan,   
Issue Date: 05 September 2009
URL:     OR
speciesosmotic potential/—MPaSH/cmRL/cmNLLA/cm2FW/mgDW/mg
significant level
plant ′osmo**********
Tab.1  Shoot height (SH), root length (RL), number of leaves (NL), leaf area (LA), fresh weight (FW) and dry weight (DW) of rice and sorghum seedlings exposed to mannitol induced osmotic stress for 14 days
speciesosmotic potential/—MPaChla/(μ?g-1 FW)Chlb/(μg?g-1 FW)TC/(μg?g-1 FW)Cx+c/(μg?g-1 FW)
significant level
plant ′osmo********
Tab.2  Chlorophyll a (Chl), chlorophyll b (Chl), total chlorophyll (TC) and total carotenoids (C) of rice and sorghum seedlings exposed to mannitol induced osmotic stress for 14 days
speciesosmotic potential/—MPaFv/FmFPSIIproline/(μmol?g-1 FW)
significant level
plant ′osmo******
Tab.3  Maximum quantum yield of PSII (/), photon yield of PSII (F), net photosynthetic rate () and proline contents of rice and sorghum seedlings exposed to mannitol induced osmotic stress for 14 days
Tab.4  Relationship between physiological and biochemical parameters of rice and sorghum seedlings exposed to mannitol induced osmotic stress for 14 days
Fig.1  Relationship between chlorophyll a degradation and maximum quantum yield of PSII (/)
Note: Rice (a) and sorghum (b) seedlings exposed to mannitol induced osmotic stress for 14 days. Error bars represent ±.
Fig.2  Relationship between total chlorophyll degradation and photon yield of PSII (F)
Note: Rice (a) and sorghum (b) seedlings exposed to mannitol induced osmotic stress for 14 days. Error bars represent ±.
Fig.3  Net photosynthetic rate ()
Note: Rice and sorghum seedlings exposed to mannitol induced osmotic stress for 14 days. Error bars represent ±.
Fig.4  Relationship between photon yield of PSII (F) and net photosynthetic rate ()
Note: Rice (a) and sorghum (b) seedlings exposed to mannitol induced osmotic stress for 14 days. Error bars represent ±.
Fig.5  Relationship between net photosynthetic rate () and plant dry weight
Note: Rice (a) and sorghum (b) seedlings exposed to mannitol induced osmotic stress for 14 days. Error bars represent ±.
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