scholarly journals Foliar water‐uptake strategies are related to leaf water status and gas exchange in plants from a ferruginous rupestrian field

2019 ◽  
Vol 106 (7) ◽  
pp. 935-942 ◽  
Author(s):  
Daniela Boanares ◽  
Alessandra R. Kozovits ◽  
José P. Lemos‐Filho ◽  
Rosy M. S. Isaias ◽  
Ricardo R. R. Solar ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Water Uptake ◽  
Water Status ◽  
Leaf Water ◽  
Leaf Water Status ◽  
Foliar Water Uptake

scholarly journals Seasonal leaf gas exchange and water potential in a woody cerrado species community

2004 ◽  
Vol 16 (1) ◽  
pp. 7-16 ◽  
Author(s):  
Carlos Henrique Britto de Assis Prado ◽  
Zhang Wenhui ◽  
Manuel Humberto Cardoza Rojas ◽  
Gustavo Maia Souza
Keyword(s):  
Gas Exchange ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Leaf Gas Exchange ◽  
Water Status ◽  
Dry Season ◽  
Leaf Water ◽  
Wet Season ◽  
Leaf Water Status ◽  
Mean Values

Predawn leaf water potential (psipd) and morning values of leaf gas exchange, as net photosynthesis (A), stomatal conductance (gs), transpiration (E), and morning leaf water potential (psimn) were determined seasonally in 22 woody cerrado species growing under natural conditions. Despite the lower mean values of psipd in the dry season (-0.35 ± 0.23 MPa) compared to the wet season (-0.08 ± 0.03 MPa), the lowest psipd in the dry season (-0.90 ± 0.00 MPa) still showed a good nocturnal leaf water status recovery for all species studied through out the year. Mean gs values dropped 78 % in the dry season, when the vapor pressure of the air was 80% greater than in the wet season. This reduction in gs led to an average reduction of 33% in both A and E, enabling the maintainance of water use efficiency (WUE) during the dry season. Network connectance analysis detected a change in the relationship between leaf gas exchange and psimn in the dry season, mainly between gs-E and E-WUE. A slight global connectance value increase (7.25 %) suggested there was no severe water stress during the dry season. Multivariate analysis showed no link between seasonal response and species deciduousness, suggesting similar behavior in remaining leaves for most of the studied species concerning leaf gas exchange and psimn under natural drought.

Yellow lupin (Lupinus luteus) tolerates waterlogging better than narrow-leafed lupin (L. angustifolius) II. Leaf gas exchange, plant water status, and nitrogen accumulation

2000 ◽  
Vol 51 (6) ◽  
pp. 711 ◽  
Author(s):  
C. L. Davies ◽  
D. W. Turner ◽  
M. Dracup
Keyword(s):  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Water Status ◽  
Recovery Period ◽  
Leaf Water ◽  
Lupinus Luteus ◽  
Nitrogen Accumulation ◽  
Growth Responses ◽  
Yellow Lupin ◽  
Leaf Water Status

Yellow lupin (Lupinus luteus) may have potential as a legume crop in waterlogging-prone areas of Western Australia. To elucidate the physiological response of yellow lupin and the widely grown narrow-leafed lupin (L. angustifolius) to transient waterlogging we conducted experiments in controlled environments. Narrow-leafed lupin and yellow lupin were grown in pots and waterlogged for 14 days from 28 to 42, or 56 to 70 days after sowing, each being followed by a 14-day recovery period. Root and shoot growth responses, leaf gas exchange, water relations, and N accumulation were assessed. During the period of waterlogging, net nitrogen accumulation ceased in both species at both ages. During recovery, yellow lupin accumulated more nitrogen than narrow-leafed lupin. Waterlogging reduced leaf gas exchange more with older plants than with younger plants, and more so with narrow-leafed lupin than yellow lupin. Some components of leaf gas exchange, particularly leaf conductance, were reduced by up to 80%. Waterlogging had no effect on leaf water potential of yellow lupin but reduced it in narrow-leafed lupin, from about –450 to –1100 kPa, especially during the recovery period. Yellow lupin was more adapted to transient waterlogging than narrow-leafed lupin because it maintained its leaf water status, it accumulated more nitrogen during recovery, and its photosynthetic activity recovered quickly afterremoval of waterlogging.

Water relations and gas exchange in young coconut palm (Cocos nucifera L.) as influenced by water deficit

1997 ◽  
Vol 75 (1) ◽  
pp. 18-27 ◽  
Author(s):  
Anne Repellin ◽  
Serge Braconnier ◽  
Daniel Laffray ◽  
Claude Daniel ◽  
Yasmine Zuily-Fodil
Keyword(s):  
Water Vapor ◽  
Gas Exchange ◽  
Water Deficit ◽  
Drought Resistance ◽  
Water Status ◽  
Cocos Nucifera ◽  
Leaf Water ◽  
Coconut Palm ◽  
Leaf Water Status ◽  
Cocos Nucifera L

Drought is the main climatic limitation to coconut palm (Cocos nucifera L.) production. To identify early screening parameters for drought resistance, physiological responses to water deficit were investigated for the first time using containerized young plants grown outside. Three varieties were studied: 'West Coast Tall' (drought avoiding), 'Malayan Yellow Dwarf' (drought susceptible), and their progeny, the hybrid 'PB 121' (drought resistant). Leaf water status (relative water content, leaf water potential) and leaf gas exchange parameters (stomatal conductance to water vapor, net photosynthetic rate, and leaf internal CO2 concentration) were measured throughout a drying cycle induced by withholding watering. On fully hydrated plants, the sensitivity of stomata to atmospheric water vapor deficit was also investigated. In the three varieties, stomatal conductance to water vapor declined before leaf water status parameters were affected. The existence of a root-to-shoot communication system was proposed. Net photosynthetic rate was highly dependent on stomatal aperture, but nonstomatal factors also participated in the reduction of CO2 fixation. Since gas exchange rates were equally sensitive to drought in the three varieties, they could not be used as screening parameters for drought resistance. Under severe drought stress, both relative water content and leaf water potential differed significantly among populations. 'West Coast Tall' maintained a higher leaf water status than 'Malayan Yellow Dwarf'. Remarkably, the water status parameters of 'PB 121' were intermediate between those of the two parents. Similar ranking was obtained in experiments with excised leaflets. The high reproductibility of the results suggests that leaf water status parameters might be useful as early selection criteria for drought resistance in coconut palm. Key words: Cocos nucifera L., gas exchange, leaf water status parameters, water deficit, water relations.

A tracheomycosis as a tool for studying the impact of stem xylem dysfunction on leaf water status and gas exchange in Citrus aurantium L.

Trees ◽  
2009 ◽  
Vol 24 (2) ◽  
pp. 327-333 ◽  
Author(s):  
Fabio Raimondo ◽  
Andrea Nardini ◽  
Sebastiano Salleo ◽  
Santa Olga Cacciola ◽  
Maria Assunta Lo Gullo
Keyword(s):  
Gas Exchange ◽  
Water Status ◽  
Leaf Water ◽  
Citrus Aurantium ◽  
Leaf Water Status ◽  
The Impact
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