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No.51 (2004/12) >

 
Title :葉身の浸透圧調節能力からみた野生稲Oryza latifolia Desv.の耐塩性
Title alternative :Salt Tolerance of Wild Oryza Species, Oryza latifolia Desv., on the Basis of Osmotic Adjustment Ability of Leaf Blade.
Authors :仲村, 一郎
東江, 栄
村山, 盛一
飛田, 哲
柳原, 誠司
川満, 芳信
本村, 恵二
Authors alternative :Nakamura, Ichiro
Agarie, Sakae
Murayama, Seiichi
Tobita, Satoshi
Yanagihara, Seiji
Kawamitu, Yoshinobu
Motomura, Keiji
Issue Date :1-Dec-2004
Abstract :本研究では,NaCl処理後の葉身の陽イオン音量(K^+, Ca^<2+>),及び適合溶質(プロリン,スクロース)音量を測定し,O.latifoliaの浸透圧調節能力について検討した.得られた結果は以下の通りである.1) NaCl処理後のに音量は,O.latifoliaで最も高かったことから,O.latifokiaはK^+の関与する反応,すなわち液胞の浸透圧の維持や気孔開閉の調節能が高いことが示唆された.2)K^+/Na^+比と耐塩性の強弱との間に規則性は見出せなかった.3) Ca^<2+>/Na^+比と耐塩性の強弱との間に関連性は見出せなかった.4) NaCl存在下のプロリン音量は,耐塩性種の方で大きかった.また,耐塩性の高い種においてはプロリン音量と浸透ポテンシャルとの間に高い負の相関関係が認められ,浸透調節に対するプロリンの関与が示唆された.5)膨圧と水ポテンシャルの関係から,O.latifoliaは塩ストレス条件下で膨圧を維持することが明らかとなった.
To elucidate the mechanisms of salt tolerance in wild rice Oryza latifolia Desv., we have tested the ability of osmotic adjustment by comparing its content of cation (K+ and Ca^<2+>) and compatible solute (proline and sucrose) in the leaves with those of salt-sensitive wild rice Oryza rufipogon, check varieties of cultivated rice (O. sativa L.), SR26B (salt-tolerance) and IR28 (salt-susceptible). When the plants were water-cultured with 6dSm^<-1> (50mM) and 12dSm^<-1> (113mM) NaCl for 30 days, the content of K^+ and Ca^<2+> were highest in the leaves of O. latifolia among the species, suggesting that this species has higher capacity of the physiological functions regulated by K^+ and Ca^<2+>, such as osmotic adjustment in vacuole, stomatal regulation and maintaining plasmamembrane structure. However, there was no correlation between the degree of salt tolerance estimated by dry matter production and the ratio of cation contents such as K^+/Na^+ or Ca^<2+>/Na^+ in the leaves. These indices of salt tolerance were the lowest in O. latifolia due to large amounts of Na^+ in the leaves of this species. Proline contents in the salt stress-leaves were higher in the salt tolerant cultivar SR26B and O. latifolia. There was the negative significant correlation between free proline content and osmotic potential in the salt tolerant species, indicating that proline participates in osmotic adjustment in the salt tolerant species. The correlation of turgor pressure and water potential showed that O. latifolia maintained turgor pressure under the salt-stress condition.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3560
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.51 p.1 -7
Appears in Collections:No.51 (2004/12)

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