Gas-exchange characteristics, leaf water potential and chlorophyll a fluorescence in oil palm (Elaeis guineensis Jacq.) seedlings under water stress and recovery

Suresh, K.; Nagamani, C.; Ramachandrudu, K.; Mathur, R. K.

doi:10.1007/s11099-010-0056-x

Cited by 42 publications

(30 citation statements)

References 29 publications

(19 reference statements)

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“…Under water deficit, the reduction in Ψ w leads to greater stomatal closure in order to reduce the loss of water through transpiration, but the lower g s increases the resistance to CO 2 flow into the leaves, decreasing A (Chaves et al, 2009). Reduction in Ψ w , combined with reductions in A, g s and E, was also reported in coconut (Gomes et al, 2010), peach palm (Ramos et al, 2002;Alves Júnior et al, 2005) and oil palm (Suresh et al, 2010;Silva et al, 2016), subjected to water deficit with negative effects on vegetative growth. WRs of 40 and 70% favor the death of 100% of the plants from all the materials at 45 and 90 days of experiment, respectively ( Figures 1 and 2); thus, these WR values make the production of açaí seedlings unviable.…”

Section: Resultsmentioning

confidence: 85%

Morphological and physiological responses of açaí seedlings subjected to different watering regimes

Silvestre

Pinheiro

Souza

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TSeedlings of açaí obtained from plant material native to floodplains (from Laranjeira and Muaná) and adapted to upland areas (cv. BRS-Pará and ecotype Hideo) were cultivated between March and October 2013 in a greenhouse, to test the hypothesis that water requirement for seedling production varies according to the origin of plant material. The seedlings were subjected to watering regimes corresponding to 40, 70, 100 and 130% of field capacity. Regardless of plant material, the production of vigorous seedlings was feasible only under irrigation of 100 and 130% of field capacity. The seedlings produced under 130% of field capacity showed higher plant height, stem diameter, number of leaves, total leaf area, leaf and root biomass, total plant biomass and root/shoot ratio than those produced under 100% of field capacity. The former also showed higher net CO 2 assimilation rate, lower stomatal conductance and transpiration and higher instantaneous water use efficiency. In conclusion, the water requirement to produce vigorous seedlings of açaí does not vary within plant material and more vigorous seedlings are produced under irrigation of 130% of field capacity.Respostas morfológicas e fisiológicas de mudas de açaizeiros submetidas à diferentes regimes hídricos R E S U M O Mudas de açaizeiro produzidas a partir de materiais vegetais oriundos de várzea (procedência Laranjeira e Muaná) e adaptadas às áreas de terra firme (cv. BRS-Pará e cotipo Hideo) foram cultivadas entre março e outubro de 2013, em viveiro, para testar a hipótese de que a demanda de água para a produção de mudas vigorosas varia em função da origem do material vegetal. As mudas foram submetidas a regimes hídricos correspondentes a 40, 70, 100 e 130% da capacidade de campo. Independente do material vegetal, a produção de mudas vigorosas foi viável apenas nos regimes hídricos de 100% e 130% da capacidade de campo; desses, as mudas produzidas sob 130% da capacidade de campo apresentaram maior altura, diâmetro do caule, número de folhas, área foliar total, biomassa de raízes e folhas, biomassa total e razão raiz parte aérea; além disto, apresentaram maior taxa de assimilação líquida de CO 2 , menor condutância estomática e transpiração e maior eficiência instantânea do uso da água; concluindo, a demanda hídrica para produção de mudas de açaizeiro não varia com a origem do material vegetal e a produção de mudas mais vigorosas se dá pelo uso de irrigação correspondente a 130% da capacidade de campo.

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Section: Resultsmentioning

confidence: 85%

Morphological and physiological responses of açaí seedlings subjected to different watering regimes

Silvestre

Pinheiro

Souza

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…The leaf water potential of oil palm seedlings subjected to drought for 24 days was –3.6 MPa (Suresh et al 2010). In this study, cultures recovering from –3.35 MPa showed a slight increase in virulence.…”

Section: Discussionmentioning

confidence: 99%

“…Drought reduces the leaf osmotic potential of oil palm seedlings (Suresh et al 2010) and may also impose either a hyperosmotic shock (or osmotic upshift) or hyperosmotic stress on leaf-inhabiting fungi. The influence of drought stress on Fusarium spp.…”

Section: Introductionmentioning

confidence: 99%

Enhanced virulence of Fusarium species associated with spear rot of oil palm following recovery from osmotic stress

2017

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Fusarium spp., which are common inhabitants of oil palm leaves, are weak pathogens of common spear rot (CSR). We investigated the influence of osmotic stress on the growth, virulence, and activity of cell wall-degrading enzymes of CSR fungi, using potato dextrose agar (PDA) supplemented with KCl or sucrose (hyperosmotic medium). Hyperosmotic stress significantly inhibited mycelial growth, but growth rapidly recovered when mycelia were transferred to control medium. When inoculated into oil palm spear leaflets, Fusarium sp., and F. incarnatum precultured on 1.0 and 1.5 M KCl-hyperosmotic medium induced lesions that were two to four times larger than those in non-stressed cultures, suggesting enhanced virulence of the weak pathogens. Lesion size was not greatly affected in hyperosmotic cultures of moderately virulent F. sacchari. No activity of pectin lyase was detected in liquid cultures of the Fusarium isolates. All isolates except F. incarnatum BT48 secreted polygalacturonase (PG), which was active in both liquid cultures and inoculated leaves. Significantly increased PG activity (5–32-fold) was observed on leaves inoculated with hyperosmotic cultures of Fusarium sp. and F. sacchari. These findings suggest that Fusarium sp., F. incarnatum, and F. sacchari exhibit an adaptive physiological plasticity to hyperosmotic stress that results in enhanced virulence.

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“…Several authors have described variation in physiological responses of oil palms to drought (Da Silva et al, 1984;Smith, 1993;Lamade et al, 1998;Suresh et al, 2008;2010;Rivera Méndez et al, 2012;Silva et al, 2015;2017), or physiological and morphological differences between 'drought susceptible' and 'drought tolerant' material (Cornaire et al, 1989;1994). However, the criteria for defining drought tolerance are not always clear.…”

Section: Introductionmentioning

confidence: 99%

Breeding for Drought Tolerance in Oil Palm

Corley¹

2017

JOPR

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Gas-exchange characteristics, leaf water potential and chlorophyll a fluorescence in oil palm (Elaeis guineensis Jacq.) seedlings under water stress and recovery

Cited by 42 publications

References 29 publications

Morphological and physiological responses of açaí seedlings subjected to different watering regimes

Morphological and physiological responses of açaí seedlings subjected to different watering regimes

Enhanced virulence of Fusarium species associated with spear rot of oil palm following recovery from osmotic stress

Breeding for Drought Tolerance in Oil Palm

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