Remobilization of Proline and Other Nitrogen Compounds from Senescing Leaves of Maize under Water Stress |
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| Authors: | M Carceller→ P Prystupa J H Lemcoff |
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| Institution: | Authors' address: Marta Carceller, P. Prystupa and Prof. Dr J. H. Lemcoff, (corresponding author) IFEVA, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, 1417, Buenos Aires, Argentina |
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| Abstract: | The effects of water stress around anthesis on proline accumulation and translocation from leaves of two maize cultivars (DA 4F37 and DA XL636) were studied. Water stress increased leaf proline content only in DA 4F37, while proline in leaf exudates was detected only in DA XL636 water-stressed plants. Proline translocation was not associated with increased nitrogen remobilization from leaves. The accumulating proline cultivar DA 4F37 showed a higher osmotic adjustment capacity than DA XL636. Leaf proline content in water-stressed DA 4F37 plants varied with daytime. High proline concentration during the morning was found in leaves with high relative water content. This evidence would support the hypothesis that proline is involved in osmotic adjustment. |
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| Keywords: | Drought — leaf sap — nitrogen remobilization — osmotic adjustment —Zea mays L |
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