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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
04/05/2001 |
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Data da última atualização: |
30/03/2017 |
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Autoria: |
SUBBARAO, G. V.; NAM, N. H.; CHAUHAN, Y. S.; JOHANSEN, C. |
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Título: |
Osmotic adjustment, water relations and carbohydrate remobilization in pigeonpea under water deficits. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
Journal of Plant Biology, v.157, n.6, p.651-659, 2000. |
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Idioma: |
Inglês |
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Conteúdo: |
Osmotic adjustment (OA) is considered an important mechanism for drought adaptation. The objective of this study was to evaluate the contribution of OA to growth and productivity of extra-short-duration pigeonpea (Cajanus cajan (L.) Millsp.) during soil moisture deficits. Using two automated rain-out shelters, six pigeonpea genotypes were grown under well-watered conditions throught the growth period or under water deficits imposed from flowering until physiological maturity. Soil moisture content was monitored using neutron probes. Osmotic adjustment in leaves increased with the depletion of soil moisture and reached close to 0.5 MP at physiological maturity. Genotypic variation in OA (ranginc from 0.1 to 0.5 MPa) was significant. Total non-structural carbohydrates mobilized from stem for reproductive growth varied substantially among genotypes. Contribution os stem-reserves to the grain yield, however, was less than 5%. Below 30 cm depth. 60 to 80% of the plant extractable soil water not utilized at physiological maturity in the drought treatment. Genotypic variation in leaf relative water content was correlated with OA (r2 = 0.66, n = 6). Leaf OA was correlated with the amount of stem sucrose mobilized (r2 = 0.67; n = 6). The relationship between OA and leaf area duration was significant (r2 = 0.94; n = 5). Genotypic variation in leaf relative water content was correlated with crop growth rate (r2 = 0.74; n = 6) and radiation-use efficiency (r2 = 0.84; n = 6) under moisture deficits. The results indicate that OA could influence radiation use efficiency and crop growth rate of extra-short duration pigenpea indirectly by increasing leaf relative water content during soil moisture deficits. MenosOsmotic adjustment (OA) is considered an important mechanism for drought adaptation. The objective of this study was to evaluate the contribution of OA to growth and productivity of extra-short-duration pigeonpea (Cajanus cajan (L.) Millsp.) during soil moisture deficits. Using two automated rain-out shelters, six pigeonpea genotypes were grown under well-watered conditions throught the growth period or under water deficits imposed from flowering until physiological maturity. Soil moisture content was monitored using neutron probes. Osmotic adjustment in leaves increased with the depletion of soil moisture and reached close to 0.5 MP at physiological maturity. Genotypic variation in OA (ranginc from 0.1 to 0.5 MPa) was significant. Total non-structural carbohydrates mobilized from stem for reproductive growth varied substantially among genotypes. Contribution os stem-reserves to the grain yield, however, was less than 5%. Below 30 cm depth. 60 to 80% of the plant extractable soil water not utilized at physiological maturity in the drought treatment. Genotypic variation in leaf relative water content was correlated with OA (r2 = 0.66, n = 6). Leaf OA was correlated with the amount of stem sucrose mobilized (r2 = 0.67; n = 6). The relationship between OA and leaf area duration was significant (r2 = 0.94; n = 5). Genotypic variation in leaf relative water content was correlated with crop growth rate (r2 = 0.74; n = 6) and radiation-use efficiency (r2 = 0.84; n = 6) under moistu... Mostrar Tudo |
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Palavras-Chave: |
Ajuste osmotico; Extracao de agua; Osmotic adjustment; Plant; Water extraction. |
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Thesagro: |
Cajanus Cajan; Planta; Resistência a Seca. |
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Categoria do assunto: |
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Marc: |
LEADER 02432naa a2200253 a 4500
001 1806257
005 2017-03-30
008 2000 bl --- 0-- u #d
100 1 $aSUBBARAO, G. V.
245 $aOsmotic adjustment, water relations and carbohydrate remobilization in pigeonpea under water deficits.
260 $c2000
520 $aOsmotic adjustment (OA) is considered an important mechanism for drought adaptation. The objective of this study was to evaluate the contribution of OA to growth and productivity of extra-short-duration pigeonpea (Cajanus cajan (L.) Millsp.) during soil moisture deficits. Using two automated rain-out shelters, six pigeonpea genotypes were grown under well-watered conditions throught the growth period or under water deficits imposed from flowering until physiological maturity. Soil moisture content was monitored using neutron probes. Osmotic adjustment in leaves increased with the depletion of soil moisture and reached close to 0.5 MP at physiological maturity. Genotypic variation in OA (ranginc from 0.1 to 0.5 MPa) was significant. Total non-structural carbohydrates mobilized from stem for reproductive growth varied substantially among genotypes. Contribution os stem-reserves to the grain yield, however, was less than 5%. Below 30 cm depth. 60 to 80% of the plant extractable soil water not utilized at physiological maturity in the drought treatment. Genotypic variation in leaf relative water content was correlated with OA (r2 = 0.66, n = 6). Leaf OA was correlated with the amount of stem sucrose mobilized (r2 = 0.67; n = 6). The relationship between OA and leaf area duration was significant (r2 = 0.94; n = 5). Genotypic variation in leaf relative water content was correlated with crop growth rate (r2 = 0.74; n = 6) and radiation-use efficiency (r2 = 0.84; n = 6) under moisture deficits. The results indicate that OA could influence radiation use efficiency and crop growth rate of extra-short duration pigenpea indirectly by increasing leaf relative water content during soil moisture deficits.
650 $aCajanus Cajan
650 $aPlanta
650 $aResistência a Seca
653 $aAjuste osmotico
653 $aExtracao de agua
653 $aOsmotic adjustment
653 $aPlant
653 $aWater extraction
700 1 $aNAM, N. H.
700 1 $aCHAUHAN, Y. S.
700 1 $aJOHANSEN, C.
773 $tJournal of Plant Biology$gv.157, n.6, p.651-659, 2000.
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Registro original: |
Embrapa Pantanal (CPAP) |
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