Basis of limited-transpiration rate under elevated vapor pressure deficit and high temperature among sweet corn cultivars

Jafarikouhini, Nahid; Pradhan, Deepti; Sinclair, Thomas R.

doi:10.1016/j.envexpbot.2020.104205

Cited by 12 publications

(22 citation statements)

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“…An indirect measure of hydraulic conductance of water flow in leaves by pressurizing the rhizosphere also indicated a positive correlation between the limited-transpiration breakpoint and this index of hydraulic conductance. Jafarikouhini et al (2020) extended the study of the limitedtranspiration trait and hydraulic conductance in maize to commercial sweet corn cultivars. In contrast to the field maize studied by Gholipoor et al (2013), it was found that nearly all of the commercial sweet corn cultivars (13 out of 16) expressed the limited-transpiration trait when measured at 32 ˚C.…”

Section: Crop Sciencementioning

confidence: 99%

“…Once the plants had produced four fully developed leaves at approximately 4 wk old after sowing, their transpiration rates over a range of VPD were measured. The measurement details are described by Jafarikouhini et al (2020). Briefly, individual plants were enclosed in transparent 21-L containers to measure gravimetrically their transpiration rate at various VPD values in the range of 1.0-3.5 kPa.…”

Section: Measurement Of Transpiration Response To Vpdmentioning

confidence: 99%

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Limited‐transpiration rate and plant conductance in a diverse sweet corn population

2021

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Limited-transpiration rate at elevated vapor pressure deficit (VPD) can allow soil water conservation for use during late-season drought, but it can also result in decreased crop yields under well-watered conditions because of restricted crop gas exchange. Previous studies with sweet corn (Zea mays L.) have found the limitedtranspiration rate was quite common among commercial cultivars even though sweet corn is commonly grown under well-watered conditions. This study was undertaken to identify possible genetic sources of sweet corn that were not encumbered by the limited-transpiration trait. Additionally, data were obtained to compare the plant hydraulic conductance among the lines. Among the 26 sweet corn lines included in this study, only eight did not express the limited-transpiration trait. Four of the lines not expressing the limited-transpiration (IL395a, IL543c, P39, and SD245) had stomata vapor conductance values over the range of tested VPD similar to the values expressed by many of the limited-transpiration lines only at low VPD. The eight lines not expressing the limited-transpiration trait tended to have low plant hydraulic conductance. For those lines expressing the limited-transpiration trait, there was a correlation between the VPD at initiation of limited transpiration and plant hydraulic conductance. Expression of the limited-transpiration traits proved, however, to be temperature sensitive in 7 of 18 tested lines expressing the trait at 32 ˚C because they failed to express the trait at 38 ˚C. The genetic variation in expression of the limitedtranspiration trait and plant hydraulic conductance identified in this study offers specific candidate inbred lines that could be used as genetic resources for improving sweet corn growth and yield for well-watered environments. INTRODUCTIONGas exchange by plants through stomata necessarily means that the ratio of plant growth and water loss are intimately linked. Therefore, water-deficit conditions that result in limited water loss from leaves also result in limited growth. However, to enhance crop seed yield from the available water, itAbbreviations: VPD, vapor pressure deficit.

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Section: Crop Sciencementioning

confidence: 99%

Section: Measurement Of Transpiration Response To Vpdmentioning

confidence: 99%

Limited‐transpiration rate and plant conductance in a diverse sweet corn population

2021

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“…Tr was the main driving force behind the absorption and transportation of water. It can accelerate the rate of inorganic salt transport to the above-ground part of the plant, reduce the plant body temperature, and induce leaf photosynthesis under strong light conditions without harming the plant (Lapidot et al, 2019;Jafarikouhini et al, 2020). We found that Tr gradually increased as PAR increased, and the Tr value of each treatment group gradually decreased as the shading degree increased.…”

Section: Discussionmentioning

confidence: 72%

Light Intensity Influence on Growth and Photosynthetic Characteristics of Horsfieldia hainanensis

Wang

Chen²,

Du³

et al. 2021

Front. Ecol. Evol.

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Due to both anthropogenic and natural causes, the number of Horsfieldia hainanensis has been decreasing each year in the Tongza Branch nursery (109.534 525°E, 18.763 516°N) of the Hainan Academy of Forestry, China. Consequently, the protection of H. hainanensis is urgent, as is that of most rare tree species. To develop a more comprehensive understanding of the H. hainanensis growth environment, we took 3-year-old H. hainanensis saplings as the research object. We controlled the light intensity by setting different shade amounts to explore the growth and photosynthetic characteristics of H. hainanensis under different light intensities. We found that shade can promote growth and increase the contents of certain substances. Light transmittance of 44.41% can increase plant height (by 29.545%) and biomass (by 66.676%). Light transmittance of 16.19% can increase the pigment content; Chl increased by 40.864%, Chl a increased by 38.031%, and Chl b increased by 48.412%. Light transmittance of 7.30% can increase the soil plant analysis development (SPAD) value of each part of the leaf; the leaf base increased by 41.000%, the leaf margin increased by 32.574%, the blade tip increased by 49.003%, and the leaf average increased by 40.466%. The specific leaf area can reduce the specific leaf weight. We also found that compared to full light, reducing the light transmittance can increase the total chlorophyll (Chl), chlorophyll A (Chl a), and chlorophyll B (Chl b) contents, and the Chl-SPAD-leaf base, leaf edge, leaf tip, average content, and light-saturated net photosynthetic rate. This can in turn reduce the apparent quantum efficiency (AQY), light compensation point (LCP), and dark respiration rate (Rd). In addition, we found a strong correlation between seven of the photosynthetic pigment indicators (Chl, Chla, Chl b, Chl-SPAD-leaf base, leaf margin, leaf tip, and mean) and the three photosynthesis physiological parameters (AQY, LCP, and Rd). The light transmittance of 44.41% (one layer of shading net) treatment group was conducive to the growth of H. hainanensis and photosynthetic characteristic improvement. Therefore, our light transmittance selection of approximately 44.4% is significant for the natural return of H. hainanensis.

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“…Five commercial cultivars were selected from the study reported by Jafarikouhini et al. (2020). Two had low VPD breakpoints in transpiration rate with increasing VPD (1.48 and 1.57 kPa), and three had higher VPD breakpoints (2.14–2.38 kPa).…”

Section: Methodsmentioning

confidence: 99%

“…A protocol for measuring rate of stomata closure was developed based on the premise that stomata aperture could be visually monitored following a change in the hydraulic status of a leaf. Specifically, stomata were initially closed by subjecting the plants to elevated VPD as previously documented for these sweet corn genotypes (Jafarikouhini et al., 2020, 2022). The leaves were then severed under water from the plants and the time for stomata opening as a result of the increased access to water was measured.…”

Section: Methodsmentioning

confidence: 99%

Comparison of water flow capacity in leaves among sweet corn genotypes as basis for plant transpiration rate sensitivity to vapor pressure deficit

2022

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Genotypes in crop species have been identified that initiate partial stomata closure at elevated atmospheric vapor pressure deficit (VPD), which results in conserved soil water for crop use during subsequent water‐deficit episodes and thereby allowing for possible yield increase. In sweet corn (Zea mays L), 17 genotypes have been previously identified with the VPD‐responsive trait, although the VPD value at the initiation of stomata closure varied among genotypes. A hypothesis to explain variation in transpiration response to VPD is that water flow capacity in the leaves differs among genotypes. To gauge water flow capacity in leaves, the rate of stomata opening was observed visually after stomata closure was induced by 3 kPa VPD. The stomata opening time was rapid and varied among genotypes from 90 to 179 s. However, there was no correlation between opening time and the VPD at which partial stomata closure was initiated in intact plants. An additional set of experiments was done to examine whether genotypic differences in a subpopulation of silver‐inhibited aquaporins might contribute to differences in leaf water flow. There was a correlation among genotypes between slow opening time of the stomata and greater inhibition of transpiration rate following feeding leaves with silver ion. However, the response to the silver treatment did not correlate with the VPD at which transpiration decrease of intact plants was initiated. These results indicate that the differences observed in the water flow capacity in sweet corn leaves were not major factors accounting for the genotypic differences in whole‐plant transpiration response to elevated VPD.

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Basis of limited-transpiration rate under elevated vapor pressure deficit and high temperature among sweet corn cultivars

Cited by 12 publications

References 11 publications

Limited‐transpiration rate and plant conductance in a diverse sweet corn population

Limited‐transpiration rate and plant conductance in a diverse sweet corn population

Light Intensity Influence on Growth and Photosynthetic Characteristics of Horsfieldia hainanensis

Comparison of water flow capacity in leaves among sweet corn genotypes as basis for plant transpiration rate sensitivity to vapor pressure deficit

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