Water stress induced changes in concentrations of proline and total soluble sugars in nodulated alfalfa (<i>Medicago sativa</i>) plants

Physiologia Plantarum - Tập 84 Số 1 - Trang 55-60 - 1992
Juan José Irigoyen1, D. W. Einerich2, Manuel Sánchez‐Díaz1
1Dept de Fisiología Vegetal, Univ. de Navarra, E‐31080 Pamplona, Spain
2Dept of Biochemistry, 117 Schweitzer Hall, Univ. of Missouri, 65211 Columbia, MO, USA.

Tóm tắt

Susceptibility of alfalfa (Medicago sativa L. cv. Aragón) nodules and leaves to water stress has been investigated. Nodule acetylene reduction activity (ARA), leaf CO2 exchange rate (CER) as well as soluble protein, proline and total soluble sugar (TSS) contents were determined during drought. Water status was estimated as water potential (Ψw) and Relative water content (RWC) of the respective tissues. Maximum rates of ARA required higher Ψw than CER. Nodules had lower RWC for a given Ψw than leaves. Water stress reduced soluble protein content in both tissues; however, the decline in soluble protein content was detected at greater Ψw in nodules than in leaves. Proline and TSS increased in leaves and nodules, and again the threshold Ψw triggering such accumulation was higher in nodule tissues. Oior results suggest that alfalfa nodules are more susceptible to water shortage than leaves. Effects of accumulated TSS and proline upon leaf and nodule physiology are discussed in relation to protein stability (proline), pH control (proline) and osmotic adjustment (proiine and TSS). The TSS accumulation induced by water stress suggests that substrate shortage would not be the primary effect of drought on nodule activity.

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Physiologia Plantarum

Tập 84 Số 1

55-60

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