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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
18/05/1998 |
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Data da última atualização: |
30/04/2025 |
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Autoria: |
SOUZA, P. I. de M. de; EGLI, D. B.; BRUENING, W. P. |
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Afiliação: |
PLINIO ITAMAR DE MELLO DE SOUZA, CPAC. |
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Título: |
Water stress during seed filling and leaf senescence in soybean. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Agronomy Journal, Madison, v. 89, n. 5, p. 807-812, 1997. |
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Idioma: |
Inglês |
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Conteúdo: |
Water stress during seed filling could reduce soybean [Glycinemax (L.) Merr.] yield by accelerating leaf senescence and shorteningthe seed filling period. Greenhouse experiments were conducted to(i) evaluate the effect of water stress during seed fill on leaf senescenceand (ii) determine the potential role of redistributed C and N inmoderating the effect of water stress during seed fill. Soybean plants('McCall', Exp. 1; 'Elgin 87', Exp. 2) were grown in soil-filled pots.At the beginning of Growth Stage R6, two levels of water stress wereimposed until maturity: daily waterings of 60% (moderate stress) and30% (severe stress) of the water required to bring well-watered potsto field capacity. Moisture stress reduced yield by reducing seed size(8-20%) in Exp. 1 and seed number (18%) and seed size (14-32%)in Exp. 2. Moisture stress accelerated leaf senescence, as shown bymore rapid declines in leaf chlorophyll and N, and shortened theseed filling period in both experiments. In Exp. 2, a 50% depoddingtreatment was applied at the beginning of Growth Stage R6. Depod-ding delayed senescence and physiological maturity. Moisture stressaccelerated leaf senescence and reduced seed size on the depoddedplants, but the effect was less than on the nondepodded plants. Ourresults demonstrate that moisture stress during seed filling reducesyield by accelerating senescence and shortening the seed filling period.Increasing the source-sink ratio may reduce the effect of moisturestress on seed size. |
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Palavras-Chave: |
Estresse hídrico. |
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Thesagro: |
Glycine Max; Potencial Hídrico; Senescência; Soja. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02082naa a2200205 a 4500
001 1562801
005 2025-04-30
008 1997 bl uuuu u00u1 u #d
100 1 $aSOUZA, P. I. de M. de
245 $aWater stress during seed filling and leaf senescence in soybean.$h[electronic resource]
260 $c1997
520 $aWater stress during seed filling could reduce soybean [Glycinemax (L.) Merr.] yield by accelerating leaf senescence and shorteningthe seed filling period. Greenhouse experiments were conducted to(i) evaluate the effect of water stress during seed fill on leaf senescenceand (ii) determine the potential role of redistributed C and N inmoderating the effect of water stress during seed fill. Soybean plants('McCall', Exp. 1; 'Elgin 87', Exp. 2) were grown in soil-filled pots.At the beginning of Growth Stage R6, two levels of water stress wereimposed until maturity: daily waterings of 60% (moderate stress) and30% (severe stress) of the water required to bring well-watered potsto field capacity. Moisture stress reduced yield by reducing seed size(8-20%) in Exp. 1 and seed number (18%) and seed size (14-32%)in Exp. 2. Moisture stress accelerated leaf senescence, as shown bymore rapid declines in leaf chlorophyll and N, and shortened theseed filling period in both experiments. In Exp. 2, a 50% depoddingtreatment was applied at the beginning of Growth Stage R6. Depod-ding delayed senescence and physiological maturity. Moisture stressaccelerated leaf senescence and reduced seed size on the depoddedplants, but the effect was less than on the nondepodded plants. Ourresults demonstrate that moisture stress during seed filling reducesyield by accelerating senescence and shortening the seed filling period.Increasing the source-sink ratio may reduce the effect of moisturestress on seed size.
650 $aGlycine Max
650 $aPotencial Hídrico
650 $aSenescência
650 $aSoja
653 $aEstresse hídrico
700 1 $aEGLI, D. B.
700 1 $aBRUENING, W. P.
773 $tAgronomy Journal, Madison$gv. 89, n. 5, p. 807-812, 1997.
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