Leaf Water Diffusion Resistance in Clonal Tea (Camellia sinensis L.): Effects of Water Stress, Leaf Age and Clones

Sandanam, S.; Gee, Glendon W.; Mapa, R. B.

doi:10.1093/oxfordjournals.aob.a086026

Cited by 17 publications

(14 citation statements)

References 17 publications

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“…Furthermore, the higher apoplastic water content also allows a plant to better tolerate drought by transferring apoplastic water to the cytoplasm during periods of water deficits. Sandanam et al (1981) also showed significant genotypic variation in the pressure-volume curves of both young and old leaves of tea. At a given leaf ψ w , the leaf RWC was higher in drought-tolerant genotypes than in droughtsusceptible genotypes.…”

Section: Control Of Transpiration By G S and Shoot ψ Wmentioning

confidence: 92%

“…Greater stomatal densities of the droughtsusceptible genotype (Wadasinghe and Wijeratne, 1989) contributed to its higher transpiration rates. In a study comparing the water relations of three genotypes of tea, Sandanam et al (1981) also showed that the most drought tolerant genotype (DN) had the highest leaf diffusive resistance under water stress.…”

Section: Control Of Transpiration By G S and Shoot ψ Wmentioning

confidence: 99%

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Ecophysiology of tea

Costa

Mohotti

Wijeratne

2007

Braz. J. Plant Physiol.

119

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Tea [Camellia sinensis (L.) O. Kuntze] is one of the most important beverage crops in the world. The major tea-growing regions of the world are South-East Asia and Eastern Africa where it is grown across a wide range of altitudes up to 2200 m a.s.l.. This paper reviews the key physiological processes responsible for yield determination of tea and discusses how these processes are influenced by genotypic and environmental factors. Yield formation of tea is discussed in terms of assimilate supply through photosynthesis and formation of harvestable sinks (i.e. shoots). The photosynthetic apparatus and partial processes (i.e. light capture, electron transport and carboxylation) of tea show specific adaptations to shade. Consequently, maximum light-saturated photosynthetic rates of tea are below the average for C 3 plants and photoinhibition occurs at high light intensities. These processes restrict the source capacity of tea. Tea yields are sink-limited as well because shoots are harvested before their maximum biomass is reached in order to maintain quality characters of made tea. In the absence of water deficits, rates of shoot initiation and extension are determined by air temperature and saturation vapour pressure deficit, with the former having positive and the latter having negative relationships with the above rates. During dry periods, when the soil water deficit exceeds a genotypically-and environmentally-determined threshold, rates of shoot initiation and extension are reduced with decreasing shoot water potential. Tea yields respond significantly to irrigation, a promising option to increase productivity during dry periods, which are experienced in many tea-growing regions. Key words: climate change, photoinhibition, photosynthesis, shoot growth, temperature, vapour pressure deficit, water potential † All authors have contributed equally to this articleEcofisiologia do chá: O chá [Camellia sinensis (L.) O. Kuntze] é uma das mais importantes culturas para a produção de bebidas no mundo. As principais regiões de cultivo dessa espécie se concentram no sudeste da Ásia e na África oriental, onde é cultivado numa ampla faixa de altitudes, até 2200 m acima do nível do mar. Neste artigo, revisam-se processos fisiológicos centrais determinantes da produção do chá e se discutem como esses processos são influenciados por fatores genotípicos e ambientes. A produção do chá é discutida em termos de suprimento de assimilados provenientes da fotossíntese e formação de drenos (ramos) removidos na colheita. A maquinaria fotossintética e processos parciais (i.e. captura de luz, transporte de elétrons e carboxilação) da fotossíntese, em plantas de chá, exibem adaptações à sombra. Conseqüentemente, as taxas máximas de fotossíntese saturadas à luz são inferiores às da media de plantas C 3 , observando-se também fotoinibição sob altas irradiâncias. Esses processos restringem a capacidade da fonte em plantas de chá. A produção do chá é limitada pelo dreno conquanto os ramos são colhidos antes de atingirem sua biomassa máxima, o q...

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Section: Control Of Transpiration By G S and Shoot ψ Wmentioning

confidence: 92%

Section: Control Of Transpiration By G S and Shoot ψ Wmentioning

confidence: 99%

Ecophysiology of tea

Costa

Mohotti

Wijeratne

2007

Braz. J. Plant Physiol.

119

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“…However, the references cited above, although confirming the general response pattern for stomatal behaviour in COg-enriched rice plants, did not explain the ontogenetic progression because the treatments were applied only for a few days. However, seasonal changes in leaf diffusive resistance have been widely used as an indicator of stomatal responses to environmental variables and water stress in many species (Kanemasu & Tanner, 1969;Brown & Rosenberg, 1970;Gee & Federer, 1972;Turner & Begg, 1973;Jordan, Brown & Thomas, 1975;Turner & Heichel, 1977;Sandanam et al, 1981). In most of these studies, an effect of leaf age on stomatal response has been demonstrated.…”

Section: Seasonal Trends In Leaf Diffusive Resistance and Transpirationmentioning

confidence: 99%

“…Water economy and leaf diffusive resistance have been widely investigated in many cultivated crops, including rice (Kanemasu & Tanner, 1969;Turner &Begg, 1973;Imai & Murata, 1976;Turner & Heichel, 1977;Sandanam, Gee & Mapa, 1981). However, COg-induced changes in diffusive resistance (notably over long periods) have received very little attention in previous ecophysiological studies in rice plants.…”

Section: Introductionmentioning

confidence: 99%

Leaf Diffusive Resistance and Water Economy in Carbon Dioxide‐enriched Rice Plants

Khan

Madsen²

1986

New Phytologist

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SUMMARYThe leaf diffusive resistance to the transfer of water vapour and COj exchange in rice plants {Oryza sativa L., cv. IR-20) measured from the late vegetative stage to maturity, varied in response to differing CO^ enrichments. The leaf diffusive resistance of plants treated with 900 /tl r* CO2 ranged from one-half to twice that of the control plants (330//ll"'CO2).This difference was more pronounced during the heading and ripening stages. In plants treated with 600 /tl ri CO2, the diffusive resistances appeared to be smaller than in the control plants for most of the day. In the diurnal cycles, resistances were highest during the early morning and before sunset, the maximum again occurring in the plants treated with 900 fi\ T' CO^.The rate of transpiration was inversely related to the diffusive resistance, and was 20 to 100 % lower in the plants treated with 900 //I T' COj than in the controls, both in the seasonal and diurnal cycles. In plants treated with 600 //11"' CO^, the rate of transpiration was lower than in the controls in the morning but distinctly higher during the afternoon. However, the integrated total daily transpiration in 600 /il T' CO2 did not exceed that of the controls. In all cases, COa-treated plants, through their increased biomass production and economic yield, appeared to have a higher water use efficiency than the control plants.

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“…Catsky (5) noted that young leaves received a preferential portion of the water supply and that, under large water deficits, water was translocated from older leaves to younger leaves. Lockhart (11) suggested that this phenomenon would occur if the cells in both young and mature tissue had the same g. More recently, the reverse response, initial wilting in young leaves, has been observed in several perennial plants, tea (13), and orange and grapefruit (15). In grapefruit and orange, this response was associated with a lower 4i, in the older leaves (15 Statistical analyses of the effect of mild water stress and time of day on the measured and calculated parameters were performed on the University of Guelph computer using the MEANS and ANOVA procedure in the Statistical Analysis System (SAS).…”

mentioning

confidence: 99%

Differential Response in the Water Status of Immature and Mature Fronds of the Ostrich Fern (Matteuccia struthiopteris [L.] Todaro) to a Mild Water Stress

Prange¹,

Ormrod²

1983

Plant Physiol.

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Experimets were condueted In growth h ers to examine the effect of a mil water stress (-200 (2,6,9,14). Catsky (5) noted that young leaves received a preferential portion of the water supply and that, under large water deficits, water was translocated from older leaves to younger leaves. Lockhart (11) suggested that this phenomenon would occur if the cells in both young and mature tissue had the same g. More recently, the reverse response, initial wilting in young leaves, has been observed in several perennial plants, tea (13), and orange and grapefruit (15

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Leaf Water Diffusion Resistance in Clonal Tea (Camellia sinensis L.): Effects of Water Stress, Leaf Age and Clones

Cited by 17 publications

References 17 publications

Ecophysiology of tea

Ecophysiology of tea

Leaf Diffusive Resistance and Water Economy in Carbon Dioxide‐enriched Rice Plants

Differential Response in the Water Status of Immature and Mature Fronds of the Ostrich Fern (Matteuccia struthiopteris [L.] Todaro) to a Mild Water Stress

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