Water relations, growth, and leaf gas exchange as affected by water stress in Jatropha curcas

The effects of water stress and rehydration on leaf gas exchange characteristics along with changes in lipid peroxidation and pirogalol peroxidase (PG-POD) were studied in mature and in young leaves of sunflower (Helianthus annuus L.), which were grown in a greenhouse. Water stress reduced photosynthesis (Pn), stomatal conductance (g s), and transpiration (E) in both young and mature leaves. However, the amplitude of the reduction was dependent on leaf age. The intercellular CO2 concentration (Ci) was increased in mature leaves but it was not altered in young leaves. Instantaneous water use efficiency (WUE) in mature stressed leaves was reduced when compared to control leaves while in young stressed leaves it was maintained to the same level as the control. After 24h of rehydration, most of the parameters related to gas exchange recovered to the same level as the unstressed plants except gs and E in mature leaves. Water stress did not activated PG-POD independently of leaf age. However, after rehydration the enzyme activity was increased in mature leaves and remained to the same as the control in young leaves. Malondialdehyde (MDA) content was increased by water stress in both mature and young leaves. The results suggest that young leaves are more susceptible to water stress in terms of gas exchange characteristics than mature leaves although both went through oxidative estresse.

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Leaf gas exchange, water relations, nutrient content and growth in citrus and olive seedlings under salinity

Biologia Plantarum ◽

10.1007/s10535-008-0081-9 ◽

2008 ◽

Vol 52 (2) ◽

pp. 385-390 ◽

Cited By ~ 34

Author(s):

J. C. Melgar ◽

J. P. Syvertsen ◽

V. Martinez ◽

F. Garcia-Sanchez

Keyword(s):

Gas Exchange ◽

Water Relations ◽

Leaf Gas Exchange ◽

Nutrient Content

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Late Season Water Stress in Cotton: II. Leaf Gas Exchange and Assimilation Capacity

Crop Science ◽

10.2135/cropsci1996.0011183x003600040018x ◽

1996 ◽

Vol 36 (4) ◽

pp. 922-928 ◽

Cited By ~ 36

Author(s):

K. L. Faver ◽

T. J. Gerik ◽

P. M. Thaxton ◽

K. M. El‐Zik

Keyword(s):

Water Stress ◽

Gas Exchange ◽

Leaf Gas Exchange ◽

Late Season ◽

Assimilation Capacity

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PHYSIOLOGICAL RESPONSES OF THREE WOODY SPECIES SEEDLINGS UNDER WATER STRESS, IN SOIL WITH AND WITHOUT ORGANIC MATTER

Revista Árvore ◽

10.1590/0100-67622016000300009 ◽

2016 ◽

Vol 40 (3) ◽

pp. 455-464 ◽

Cited By ~ 1

Author(s):

Maria da Assunção Machado Rocha ◽

Claudivan Feitosa de Lacerda ◽

Marlos Alves Bezerra ◽

Francisca Edineide Lima Barbosa ◽

Hernandes de Oliveira Feitosa ◽

...

Keyword(s):

Organic Matter ◽

Water Stress ◽

Gas Exchange ◽

Leaf Gas Exchange ◽

Water Status ◽

Near Field ◽

Limiting Factors ◽

Water Restriction ◽

Soil Water Retention ◽

African Mahogany

ABSTRACT The low availability of water in the soil is one of the limiting factors for the growth and survival of plants. The objective of this study was to evaluate the responses of physiological processes in early growth of guanandi (Calophyllum brasilense Cambess), African mahogany (Khayai vorensis A. Chev) and oiti (Licaniato mentosa Benth Fritsch) over a period of water stress and other of rehydration in the soil with and without addition of organic matter. The study was conducted in a greenhouse and the experimental design was completely randomised into a 3 x 2 x 2 factorial scheme, comprising three species (guanandi, African mahogany, and oiti), two water regimes (with and without water restriction) and two levels of organic fertilisation (with and without the addition of organic matter). Irrigation was suspended for 15 days in half of the plants, while the other half (control) continued to receive daily irrigation, the soil being maintained near field capacity for these plants. At the end of the stress period, the plants were again irrigated for 15 days to determine their recovery. Water restriction reduced leaf water potential and gas exchange in the three species under study, more severely in soil with no addition of organic matter. The addition of this input increased soil water retention and availability to the plants during the suspension of irrigation, reducing the detrimental effects of the stress. During the period of rehydration, there was strong recovery of water status and leaf gas exchange. However recovery was not complete, suggesting that some of the effects caused by stress irreversibly affected cell structures and functions. However, of the species being studied, African mahogany displayed a greater sensitivity to stress, with poorer recovery.

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