Inhibitor screen for limited-transpiration trait among maize hybrids

Choudhary, Sunita; Sinclair, Thomas R.; Messina, Carlos D.; Cai, Weiguo; Warner, Dave; Cooper, Mark

doi:10.1016/j.envexpbot.2014.07.015

Cited by 14 publications

(20 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effects of spatial scale on VPD control of transpiration and the limited transpiration rate under a high VPD have been reported for maize under different environments (Hirasawa and Hsiao, 1999;Ray et al, 2002;Yang et al, 2012;Gholipoor et al, 2013;Choudhary et al, 2015), which were confirmed by our study that the response of maize transpiration to VPD differs considerably at different spatial and temporary levels under arid environmental climate and well-watered conditions. At the leaf level, the maize plant exhibits a breakpoint (about 3.5 kPa) in the transpiration response to VPD.…”

Section: Discussionsupporting

confidence: 90%

“…It is noteworthy, however, that the maize also had a breakpoint in the stomatal conductance response to VPD at different spatial levels during the daytime, likely stemming from the discrepancies between the stomatal conductance and canopy conductance, and between leaf boundary-layer conductance and surface-layer conductance (Collatz et al, 1991;McNaughton and Jarvis, 1991;Monteith, 1995;Takagi et al, 1998;Mott, 2007;Yang et al, 2012;Choudhary et al, 2015). While during the period of nighttime, transpiration at night is theoretically controlled by atmospheric VPD and is free of stomatal conductance regulation (Jarvis and McNaughton, 1986;Jones, 1998).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Spatio-temporal variation in transpiration responses of maize plants to vapor pressure deficit under an arid climatic condition

Zhao

2016

J. Arid Land

View full text Add to dashboard Cite

The transpiration rate of plant is physically controlled by the magnitude of the vapor pressure deficit (VPD) and stomatal conductance. A limited-transpiration trait has been reported for many crop species in different environments, including Maize (Zea mays L.). This trait results in restricted transpiration rate under high VPD, and can potentially conserve soil water and thus decrease soil water deficit. However, such a restriction on transpiration rate has never been explored in maize under arid climatic conditions in northwestern China. The objective of this study was to examine the transpiration rate of field-grown maize under well-watered conditions in an arid area at both leaf and whole plant levels, and therefore to investigate how transpiration rate responding to the ambient VPD at different spatial and temporal scales. The transpiration rates of maize at leaf and plant scales were measured independently using a gas exchange system and sapflow instrument, respectively. Results showed significant variations in transpiration responses of maize to VPD among different spatio-temporal scales. A two-phase transpiration response was observed at leaf level with a threshold of 3.5 kPa while at the whole plant level, the daytime transpiration rate was positively associated with VPD across all measurement data, as was nighttime transpiration response to VPD at both leaf and whole plant level, which showed no definable threshold vapor pressure deficit, above which transpiration rate was restricted. With regard to temporal scale, transpiration was most responsive to VPD at a daily scale, moderately responsive at a half-hourly scale, and least responsive at an instantaneous scale. A similar breakpoint (about 3.0 kPa) in response of the instantaneous leaf stomatal conductance and hourly canopy bulk conductance to VPD were also observed. At a daily scale, the maximum canopy bulk conductance occurred at a VPD about 1.7 kPa. Generally, the responsiveness of stomatal conductance to VPD at the canopy scale was lower than that at leaf scale. These results indicate a temporal and spatial heterogeneity in how maize transpiration responses to VPD under arid climatic conditions. This could allow a better assessment of the possible benefits of using the maximum transpiration trait to improve maize drought tolerance in arid environment, and allow a better prediction of plant transpiration which underpin empirical models for stomatal conductance at different spatio-temporal scales in the arid climatic conditions.

show abstract

Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Spatio-temporal variation in transpiration responses of maize plants to vapor pressure deficit under an arid climatic condition

Zhao

2016

J. Arid Land

View full text Add to dashboard Cite

show abstract

“…Genotypes expressing TR lim with increasing atmospheric VPD were also found in species other than soybean to have low hydraulic conductivity in their leaves. In maize, a possible correlation between the expression of the TR lim trait and response to silver treatment was explored [ 43 ]. The study was done with DuPont Pioneer’s AQUAmax hybrids (The DuPont Pioneer Innovation Center, Johnston, IA, USA), which have been previously shown to express the TR lim trait with increasing VPD [ 44 ].…”

Section: High Evaporative Demand [Or High Vapor Pressure Deficit (mentioning

confidence: 99%

“…The study was done with DuPont Pioneer’s AQUAmax hybrids (The DuPont Pioneer Innovation Center, Johnston, IA, USA), which have been previously shown to express the TR lim trait with increasing VPD [ 44 ]. The VPD at which TR lim was expressed was found to correlate with the degree of decrease in transpiration rate when leaves were fed with silver ion ( Figure 3 , [ 43 ]). The mean yield advantage across a wide range of field environments for AQUAmax hybrids as compared to non-AQUAmax hybrids under rainfed conditions was 36, 53, and 22 g m −2 , respectively [ 18 ].…”

Section: High Evaporative Demand [Or High Vapor Pressure Deficit (mentioning

confidence: 99%

Aquaporin Activity to Improve Crop Drought Tolerance

Shekoofa

Sinclair

2018

Cells

View full text Add to dashboard Cite

In plants, aquaporins (AQP) occur in multiple isoforms in both plasmalemma and tonoplast membranes resulting in regulation of water flow in and out of cells, and ultimately, water transfer through a series of cells in leaves and roots. Consequently, it is not surprising that physiological and molecular studies have identified AQPs as playing key roles in regulating hydraulic conductance in roots and leaves. As a result, the activity of AQPs influences a range of physiological processes including phloem loading, xylem water exit, stomatal aperture and gas exchange. The influence of AQPs on hydraulic conductance in plants is particularly important in regulating plant transpiration rate, particularly under conditions of developing soil water-deficit stress and elevated atmospheric vapor pressure deficit (VPD). In this review, we examine the impact of AQP activity and hydraulic conductance on crop water use and the identification of genotypes that express soil water conservation as a result of these traits. An important outcome of this research has been the identification and commercialization of cultivars of peanut (Arachis hypogaea L.), maize (Zea mays L.), and soybean (Glycine max (Merr) L.) for dry land production systems.

show abstract

“…There are documented interspecific differences in the proportion of water transported by each pathway; e.g., the aquaporin-mediated pathway is hypothesized to predominate in crops like barley (Knipfer et al, 2011 ), whereas the apoplastic pathways is hypothesized to predominate in crops like maize (Zimmermann and Steudle, 1998 ). In addition, the intraspecific differences in particular pathways conductivity have been shown in relation to differential water usage strategies (e.g., maize, sorghum—(Choudhary et al, 2013 , 2015 ); soybean—(Sadok and Sinclair, 2010 ); peanut—Devi et al, 2012 ). Therefore, here, we tested the hypothesis whether the differences in water transport pathways through the root (aquaporins/apoplast) could explain the differences in the transpiration responses to increased VPD.…”

Section: Introductionmentioning

confidence: 99%

Chickpea Genotypes Contrasting for Vigor and Canopy Conductance Also Differ in Their Dependence on Different Water Transport Pathways

et al. 2017

View full text Add to dashboard Cite

Lower plant transpiration rate (TR) under high vapor pressure deficit (VPD) conditions and early plant vigor are proposed as major traits influencing the rate of crop water use and possibly the fitness of chickpea lines to specific terminal drought conditions—this being the major constraint limiting chickpea productivity. The physiological mechanisms underlying difference in TR under high VPD and vigor are still unresolved, and so is the link between vigor and TR. Lower TR is hypothesized to relate to hydraulic conductance differences. Experiments were conducted in both soil (Vertisol) and hydroponic culture. The assessment of the TR response to increasing VPD showed that high vigor genotypes had TR restriction under high VPD, and this was confirmed in the early vigor parent and progeny genotype (ICC 4958 and RIL 211) having lower TR than the late vigor parent and progeny genotype (ICC 1882 and RIL 022). Inhibition of water transport pathways [apoplast and symplast (aquaporins)] in intact plants led to a lower transpiration inhibition in the early vigor/low TR genotypes than in the late vigor/high TR genotypes. De-rooted shoot treatment with an aquaporin inhibitor led to a lower transpiration inhibition in the early vigor/low TR genotypes than in the late vigor/high TR genotypes. Early vigor genotypes had lower root hydraulic conductivity than late vigor/high TR genotypes. Under inhibited conditions (apoplast, symplast), root hydraulic conductivity was reduced more in the late vigor/high TR genotypes than in the early vigor/low TR genotypes. We interpret that early vigor/low TR genotypes have a lower involvement of aquaporins in water transport pathways and may also have a smaller apoplastic pathway than high TR genotypes, which could explain the transpiration restriction under high VPD and would be helpful to conserve soil water under high evaporative demand. These findings open an opportunity for breeding to tailor genotypes with different “dosage” of these traits toward adaptation to varying drought-prone environments.

show abstract

Inhibitor screen for limited-transpiration trait among maize hybrids

Cited by 14 publications

References 47 publications

Spatio-temporal variation in transpiration responses of maize plants to vapor pressure deficit under an arid climatic condition

Spatio-temporal variation in transpiration responses of maize plants to vapor pressure deficit under an arid climatic condition

Aquaporin Activity to Improve Crop Drought Tolerance

Chickpea Genotypes Contrasting for Vigor and Canopy Conductance Also Differ in Their Dependence on Different Water Transport Pathways

Contact Info

Product

Resources

About