Interactions among stomata in response to perturbations in humidity

Mott, Keith A.; Denne, F.; Powell, James A.

doi:10.1046/j.1365-3040.1997.d01-138.x

Cited by 55 publications

(69 citation statements)

References 19 publications

(21 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result is in general agreement with Xanthium strumarium measurements by Mott et al (1997), who subjected small groups of stomata to different humidity from the rest of the leaf by directing a small stream of air to the leaf surface by a needle. Similar to the results presented here, they found that, even if stomata were under constant humidity, they responded to reduced humidity in their vicinity.…”

Section: Discussionsupporting

confidence: 91%

“…In comparison to applying streams of air (Lange et al, 1971;Mott et al, 1997;Mott and Franks, 2001), oil treatment provides a spatially better-defined manipulation of transpiration. The oil, due to capillary force, stays in place even if stomata open and close for at least 1 week.…”

Section: Discussionmentioning

confidence: 99%

“…In previous, similar attempts, small streams of dry air applied by capillaries were used to modify the local transpiration rate (Lange et al, 1971;Mott et al, 1997;Mott and Franks, 2001). In contrast, we used the new method of applying small amounts of mineral oil, which, by capillary force, are sucked into the pores and, as a barrier of hydrophobic liquid, block transpiration.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Localization of Mechanisms Involved in Hydropassive and Hydroactive Stomatal Responses of Sambucus nigra to Dry Air

Kaiser

Legner

2006

Plant Physiology

View full text Add to dashboard Cite

The response of stomata to a reduction of air humidity is composed of a hydropassive opening followed by active closure. Whereas the mechanisms behind the hydropassive opening are largely understood, the location and physiological basis of the sensing mechanisms leading to active closure are not yet known. This study attempts to evaluate the importance of a single pore's transpiration on its own response and that of adjacent pores. Selected stomata on attached intact leaves of Sambucus nigra were sealed with mineral oil and the response to a reduction of humidity was continuously observed in situ. Blocking a pore's transpiration had no appreciable effect on hydropassive opening and subsequent stomatal closure. If the adjacent stomata were additionally sealed, the closing response was reduced, but not the hydropassive opening. On the other hand, sealing the entire leaf surface, except a small area including the observed stomata, also reduced stomatal closure. These results indicate that strictly local processes triggered by a pore's own transpiration are not required to induce stomatal closure. To describe the effect of one pore's transpiration on the hydropassive and hydroactive responses of neighboring stomata, a simple spatial model was constructed. It suggests that 90% of the closing effect covers an area of approximately 0.5 mm 2 , whereas the effect on hydropassive opening affects an area of approximately 1 mm 2 . This divergence may suggest mechanisms other than or in addition to those involving changes of local leaf water potential.

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Localization of Mechanisms Involved in Hydropassive and Hydroactive Stomatal Responses of Sambucus nigra to Dry Air

Kaiser

Legner

2006

Plant Physiology

View full text Add to dashboard Cite

show abstract

“…Feed-forward could result from increased hydraulic resistance (Oren et al, 1999;Buckley and Mott, 2002b;Buckley, 2005), perhaps via modulation of r be . Variation in r be could also help reconcile the observation that stomata respond independently to humidity in the two epidermes of amphistomatous leaves (Mott, 2007) with other data that showed strong hydraulic coupling of stomatal behavior over much greater distances (Heath and Russell, 1954;Schulze and Kuppers, 1979;Mott et al, 1997;Buckley and Mott, 2000). Clarity on this issue awaits further study on the phenomenology of r be in relation to the external and leaf environment.…”

Section: Differences In the Hydraulic Connection Of The Epidermis To mentioning

confidence: 57%

The Role of Bundle Sheath Extensions and Life Form in Stomatal Responses to Leaf Water Status

2011

View full text Add to dashboard Cite

Bundle sheath extensions (BSEs) are key features of leaf structure with currently little-understood functions. To test the hypothesis that BSEs reduce the hydraulic resistance from the bundle sheath to the epidermis (r be ) and thereby accelerate hydropassive stomatal movements, we compared stomatal responses with reduced humidity and leaf excision among 20 species with heterobaric or homobaric leaves and herbaceous or woody life forms. We hypothesized that low r be due to the presence of BSEs would increase the rate of stomatal opening (V) during transient wrong-way responses, but more so during wrong-way responses to excision (V e ) than humidity (V h ), thus increasing the ratio of V e to V h . We predicted the same trends for herbaceous relative to woody species given greater hydraulic resistance in woody species. We found that V e , V h , and their ratio were 2.3 to 4.4 times greater in heterobaric than homobaric leaves and 2.0 to 3.1 times greater in herbaceous than woody species. To assess possible causes for these differences, we simulated these experiments in a dynamic compartment/resistance model, which predicted larger V e and V e /V h in leaves with smaller r be . These results support the hypothesis that BSEs reduce r be . Comparison of our data and simulations suggested that r be is approximately 4 to 16 times larger in homobaric than heterobaric leaves. Our study provides new evidence that variations in the distribution of hydraulic resistance within the leaf and plant are central to understanding dynamic stomatal responses to water status and their ecological correlates and that BSEs play several key roles in the functional ecology of heterobaric leaves.

show abstract

“…Morison and Gifford, 1984;Saxe et al, 1998;Medlyn et al, 2001) and water status on stomata (e.g. Kappen et al, 1987;Mott et al, 1997;Wilkinson and Davies, 2002). However, knowledge of the effects of ambient temperature on stomata remains limited (Zeiger, 1983;Lu et al, 2000;Feller, 2006).…”

Section: Introductionmentioning

confidence: 99%

Interactions between temperature, drought and stomatal opening in legumes

Reynolds‐Henne

Langenegger

Mani

et al. 2010

Environmental and Experimental Botany

114

View full text Add to dashboard Cite

a b s t r a c tThe effect of heat and drought on stomatal behaviour of 2-4-week-old legumes, bean (Phaseolus vulgaris L.) and red clover (Trifolium pratense), was investigated. Drought stress was induced by complete water deficit or with polyethylene glycol (PEG), and abscisic acid (ABA) was applied to mimic plant drought response. Heat stress was simulated by water bath (leaf segments) and infrared and halogen lighting (whole plants). Various experimental conditions were studied: high temperature alone or combined with drought, and low or high photosynthetically active radiation (PAR). Stomatal opening was either measured directly or determined using thermal imaging as a proxy. When water was not limiting, stomata opened in darkness under heat stress. At high PAR, drought and moderate heat caused increased leaf temperatures and temperature oscillations (±3-4• C), attributed to the opening and closing of stomata. At low PAR, heat led to leaf temperature oscillations in control plants, whereas the application of drought caused stomatal closure, increasing leaf temperature to 39• C. Stomatal opening occurred under high temperatures, despite the presence of the drought-induced hormone ABA, and was maintained into a recovery period at room temperature for 30 min. This study helps to illustrate stomatal plasticity and the interplay between leaf gas-exchange and maintaining favourable metabolic conditions (water status and temperature) within the leaf. Knowledge of how legumes are affected by two environmental stresses, heat and drought, expected to occur simultaneously with greater frequency in the future, is important in determining overall plant survival strategies.

show abstract

Interactions among stomata in response to perturbations in humidity

Cited by 55 publications

References 19 publications

Localization of Mechanisms Involved in Hydropassive and Hydroactive Stomatal Responses of Sambucus nigra to Dry Air

Localization of Mechanisms Involved in Hydropassive and Hydroactive Stomatal Responses of Sambucus nigra to Dry Air

The Role of Bundle Sheath Extensions and Life Form in Stomatal Responses to Leaf Water Status

Interactions between temperature, drought and stomatal opening in legumes

Contact Info

Product

Resources

About