Stomatal response to air humidity and its relation to stomatal density in a wide range of warm climate species

1985 ◽  
Vol 7 (2) ◽  
pp. 137-149 ◽  
Author(s):  
Mabrouk A. El-Sharkawy ◽  
James H. Cock ◽  
Ana Del Pilar Hernandez
Keyword(s):  
Stomatal Density ◽  
Stomatal Response ◽  
Air Humidity ◽  
Warm Climate ◽  
Wide Range

Stomatal Development During Leaf Expansion in Tobacco and Sunflower

1975 ◽  
Vol 23 (2) ◽  
pp. 253 ◽  
Author(s):  
HM Rawson ◽  
CL Craven
Keyword(s):  
Leaf Area ◽  
Stomatal Density ◽  
Stomatal Development ◽  
Developmental Patterns ◽  
Full Size ◽  
Unit Leaf Area ◽  
Unit Leaf ◽  
Wide Range ◽  
Young Leaves ◽  
Different Levels

Changes in stomatal density and size were followed in tobacco and sunflower leaves expanding from 10% of final area (10% Amax) to Amax under different levels of radiation. Lower radiation increased final leaf area, reduced stomatal densities, and increased area per stoma but had little effect on stomatal area per unit leaf area at Amax. In very young leaves (20% Amax) there was a wide range in the sizes of individual stomata, some stomata being close to full size, but by Amax differences were small. The possible relationship between the developmental patterns described and photosynthesis is briefly discussed.

N-glycosylation is involved in stomatal development by modulating the release of active abscisic acid and auxin in Arabidopsis

2020 ◽  
Vol 71 (19) ◽  
pp. 5865-5879 ◽  
Author(s):  
Qingsong Jiao ◽  
Tianshu Chen ◽  
Guanting Niu ◽  
Huchen Zhang ◽  
ChangFang Zhou ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Abiotic Stress ◽  
Strong Evidence ◽  
Stomatal Density ◽  
Abiotic Stress Tolerance ◽  
Stomatal Development ◽  
Drought Avoidance ◽  
Wide Range ◽  
Transpirational Water Loss ◽  
And Function

Abstract Asparagine-linked glycosylation (N-glycosylation) is one of the most important protein modifications in eukaryotes, affecting the folding, transport, and function of a wide range of proteins. However, little is known about the roles of N-glycosylation in the development of stomata in plants. In the present study, we provide evidence that the Arabidopsis stt3a-2 mutant, defective in oligosaccharyltransferase catalytic subunit STT3, has a greater transpirational water loss and weaker drought avoidance, accompanied by aberrant stomatal distribution. Through physiological, biochemical, and genetic analyses, we found that the abnormal stomatal density of stt3a-2 was partially attributed to low endogenous abscisic acid (ABA) and auxin (IAA) content. Exogenous application of ABA or IAA could partially rescue the mutant’s salt-sensitive and abnormal stomatal phenotype. Further analyses revealed that the decrease of IAA or ABA in stt3a-2 seedlings was associated with the underglycosylation of β-glucosidase (AtBG1), catalysing the conversion of conjugated ABA/IAA to active hormone. Our results provide strong evidence that N-glycosylation is involved in stomatal development and participates in abiotic stress tolerance by modulating the release of active plant hormones.

scholarly journals Stomatal Response to Evaporative Demand Depending on Air Humidity and Wind

2004 ◽  
Vol 42 (4) ◽  
pp. 323-329 ◽  
Author(s):  
Daisuke YASUTAKE ◽  
Masaharu KITANO ◽  
Michio HAMAKOGA ◽  
Kota HIDAKA ◽  
Toshio KAWANO ◽  
...  
Keyword(s):  
Stomatal Response ◽  
Air Humidity ◽  
Evaporative Demand

Do sexual gonadic maturity and age determine habitat occupancy of Canthon cyanellus LeConte, 1859 (Coleoptera: Scarabaeidae)?

2021 ◽  
pp. 1-16
Author(s):  
Renato Portela Salomão ◽  
Lucrecia Arellano ◽  
Carmen Huerta ◽  
Jorge Leonel León-Cortés
Keyword(s):  
Habitat Type ◽  
Dung Beetle ◽  
Mature Female ◽  
Forest Fragments ◽  
Air Humidity ◽  
Young Males ◽  
Habitat Occupancy ◽  
Soil Hardness ◽  
Wide Range ◽  
Live Fences

Abstract High-quality habitats presumably have the resources required to sustain relatively high rates of survival and reproduction. We assessed how habitat type and local environmental conditions determine the distribution of individuals of Canthon cyanellus (Coleoptera: Scarabaeidae), an eurytopic dung beetle, according to age category and sexual gonadic maturity. Beetles were surveyed in forest fragments, live fences, and pastures in Mexico. Individuals were categorised into six age categories according to the glandular volumes in males and oocyte number and length in females. Mature females in forest fragments were the most abundant females found among the habitats. Air humidity and soil hardness were positively and negatively related to mature female abundance, respectively. Mature beetles were the most abundant among males, and higher abundance of males occurred in forest fragments than in live fences and pastures. Light quantity was negatively related to the abundance of young males. Compared to forest fragments, females in pastures had larger oocytes. However, sites with higher soil hardness and air humidity had females with lower numbers of oocytes. Our results demonstrate that, although C. cyanellus occurs across a wide range of habitats, forest habitats might host sexually mature individuals, which translates into more effective individual dispersion and potential reproduction.

Does increased air humidity affect stomatal morphology and functioning in hybrid aspen?

Botany ◽  
2015 ◽  
Vol 93 (4) ◽  
pp. 243-250 ◽  
Author(s):  
Aigar Niglas ◽  
Meeli Alber ◽  
Kristi Suur ◽  
Anna K. Jasińska ◽  
Priit Kupper ◽  
...  
Keyword(s):  
Vapour Pressure ◽  
Stomatal Density ◽  
Vapour Pressure Deficit ◽  
Carbon Gain ◽  
Hybrid Aspen ◽  
Air Humidity ◽  
Response Curves ◽  
Opposite Pattern ◽  
Stomatal Morphology ◽  
Stomatal Sensitivity

The study investigated the effects of exposure to increased relative air humidity (RH) on stomatal morphology and sensitivity to stomata closure inducing stimulus (low RH) in hybrid aspen (Populus tremula L. × P. tremuloides Michx.) coppice growing in field conditions. Artificially elevated RH reduced air vapour pressure deficit by 5%–10% and altered stomatal sensitivity; trees grown under high RH exhibited stronger stomatal response to decreasing air humidity. We found no difference in mean stomatal pore length between treatments and a small decline in stomatal density under humidification. The lack of correlation between stomatal sensitivity and morphological traits suggests that stomatal sensitivity was unaffected by stomatal morphology. In light of rising atmospheric humidity predicted for high latitudes, strict stomatal control over water loss might be beneficial for trees if drought events become more frequent in the future. However, our experiment revealed that about two-thirds of the leaf-to-air vapour pressure difference (VPDL) response curves demonstrated the opposite pattern, i.e., stomatal opening in response to increasing VPDL. Strict stomatal regulation is probably not beneficial to fast-growing aspen coppice under low RH, as this trait may restrict their carbon gain and growth rate.

Spatial heterogeneity in stomatal features during leaf elongation: an analysis using Rosa hybrida

2015 ◽  
Vol 42 (8) ◽  
pp. 737 ◽  
Author(s):  
Dimitrios Fanourakis ◽  
Ep Heuvelink ◽  
Susana M. P. Carvalho
Keyword(s):  
Stomatal Density ◽  
Rosa Hybrida ◽  
Air Humidity ◽  
Leaf Elongation ◽  
Evaporative Demand ◽  
Mature Leaves ◽  
Relative Air Humidity ◽  
Promotive Effect ◽  
Leaf Variation ◽  
Final Length

Within-leaf heterogeneity in stomatal traits poses a key uncertainty in determining a representative value for the whole leaf. Accounting for this heterogeneity, we studied stomatal initiation on expanding leaves and estimated stomatal conductance (gs) of mature leaves. The entire lamina was evaluated at four percentages of full leaflet elongation (FLE; leaflet length relative to its final length) in Rosa hybrida L. plants grown at 60% relative air humidity (RH), and at 100% FLE following cultivation at elevated (95%) RH. Over 80% of the stomata were initiated between 33 and 67% FLE, whereas stomatal growth mostly occurred afterwards. At 100% FLE, the heterogeneity in stomatal density was the result of uneven stomatal differentiation, while an uneven differentiation of epidermal cells contributed to this variation only at elevated RH. Noticeable within-leaf differences (up to 40%) in gs were calculated at 100% FLE. Avoiding leaflet periphery decreased this heterogeneity. Despite the large promotive effect of elevated RH on stomatal and pore dimensions, the within-leaf variation remained unaffected in all characters, besides pore aperture (and, thus, gs). The noted level of within-leaf variation in stomatal features demands a sampling scheme tailored to the leaf developmental stage, the feature per se and the evaporative demand during growth.

Water Efficiency of Cassava. II. Differing Sensitivity of Stomata to Air Humidity in Cassava and Other Warm‐Climate Species 1

Crop Science ◽  
1984 ◽  
Vol 24 (3) ◽  
pp. 503-507 ◽  
Author(s):  
Mabrouk A. El‐Sharkawy ◽  
James H. Cock ◽  
Alexander A. Held K.
Keyword(s):  
Water Efficiency ◽  
Air Humidity ◽  
Warm Climate
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