Effect of temperature and water stresses on gas exchange, fluorescence kinetics, and solute levels of jojoba

Ceccardi, Toni L.; Ting, Irwin P.

doi:10.1016/s0926-6690(96)00026-x

Cited by 3 publications

(5 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Germino and Smith [56] found that A following the warm nights was 35% higher than following cold nights for Caltha leptosephala, an alpine herb from same habitat as P. gracilis. The reduction in A after chilling nights in the present study is also in agreement with investigations of grape (Vitis vinifera) [27] and jojoba (Simmondsia chinensis) [28]. Assimilation is also inhibited in winter rye when plants are exposed to short-term (prior night) low temperatures [25] [25].…”

Section: Effect Of Night Temperature On Pgesupporting

confidence: 92%

“…Suppression in assimilation in cold-stressed plants results from the combined effects of light and cold temperature. Previous studies have shown that Photosynthesis is significantly reduced in Vitis vinifera [27] and in jojoba (Simmondsia chinensis) after exposure to subfreezing temperature at night due to dark respiration [28]. The amount of dark respiration in cold acclimated plant varies from species to species.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Ecophysiology ofpotentilla gracilisdouglas ex hook (rosaceae): effects of night temperature and water stress on photosynthetic gas exchange

Nepal

Berg

2019

Preprint

View full text Add to dashboard Cite

Plants in stressful environments have evolved strategies to cope with fluctuating environmental conditions. Potentilla gracilis, also known as Alpine Cinquefoil, grows in alpine meadows of the Rocky Mountains (USA), and is subjected to wide ranges of temperature, light intensity and water availability on a time scale of minutes to days during the growing season. Leaves often freeze to a brittle state at night, are exposed to high radiation while still frosty, dehydrate to wilting during the following light period, and then repeat the cycle the following day. The main objective of this research was to determine the effect of night temperature on subsequent photosynthetic gas exchange in P. gracilis. We used a photosynthetic gas exchange system to compare assimilation and stomatal conductance from light response curves of cold-acclimated P. gracilis following warm and chilling nights, and for plants at different water potentials. From the light response curves, dark respiration, light compensation point, maximum assimilation, light saturation point, and inhibition of photosynthesis were determined and were compared among the same plants under varying conditions. Assimilation and stomatal conductance decreased with the fall in measurement temperature, following chilling nights, and with the severity of water stress. Low night temperature and high photon flux density during the daytime, which are very common during the growing season in the field, cause a reduction in photosynthesis of the plant. The probable underlying damage during inhibition is likely repairable indicating protection rather than damage. The cold nocturnal temperature, with its less efficient biochemical repair capabilities, may partly be responsible for the reduction in assimilation of the following day. P. gracilis species exhibited persistent acquired freezing tolerance; substantial photosynthetic productivity over a wide range of light intensity and temperature; and significant tolerance of, and rapid recovery from, severe drought; making a maximum use of often challenging resources.[9]. Non-acclimated rye, for example, is killed by freezing at about 5 °C, but after a period of exposure to low nonfreezing temperature, it can survive below 30°C [10]. In freezing sensitive plants, ice formation occurs inside the cytoplasm, which kills the cell. However, ice forms extracellularly withdrawing water from inside the cell in freezing tolerant plants [11]. As the temperature goes down, ice formation accelerates. Cells of freezing tolerant plants are killed when they cannot tolerate the cellular dehydration, because of failure of the membrane [12]. Such defects include alteration in membrane lipid composition or metabolic modifications [13], changes in protein content [14], enzyme activities [15], redistribution of intracellular calcium ions [16], cellular leakage of electrolytes and amino acids, and a diversion of electron flow to alternate pathways [17]. Cold acclimated plants have a higher concentration of starch at the end of the acclimation period ...

show abstract

Section: Effect Of Night Temperature On Pgesupporting

confidence: 92%

mentioning

confidence: 99%

Ecophysiology ofpotentilla gracilisdouglas ex hook (rosaceae): effects of night temperature and water stress on photosynthetic gas exchange

Nepal

Berg

2019

Preprint

View full text Add to dashboard Cite

show abstract

“…1). Larrea j pd at east and ridge-top locations equaled the lowest field values recorded for this species (Hamerlynck et al, 2000;Pockman and Sperry, 1997), while jojoba predawn j pd were À4.0 to À2.0 MPa lower than j previously observed at midday (Ceccardi and Ting, 1996;Woodhouse, 1978), when j is usually much lower.…”

mentioning

confidence: 50%

mentioning

confidence: 99%

“…Larrea and jojoba can maintain positive photosynthetic rates under hot and dry conditions (Ceccardi and Ting, 1996;Feldman, 1988;Hamerlynck et al, 2000;Woodhouse, 1978). Compared to Larrea, jojoba has a dense canopy of large leaves (Ceccardi and Ting, 1996), while Larrea has an open canopy of small leaves (Smith et al, 1997). Morphological and structural differences such as these frequently coincide with differences in physiological tolerance and acclimation to drought and light (Abrams et al, 1994;Adams et al, 1999;Hamerlynck and Knapp, 1996;Wright et al, 2001).…”

mentioning

confidence: 99%

See 1 more Smart Citation