Stomatal conductance of maize under water and nitrogen deficits

Abstract

-The objective of this work was to evaluate the effect of drought and nitrogen (N) stresses on stomatal conductance of three maize cultivars grown in the field. The stomatal conductance of Sol da Manhã variety (BRS 4157) and Pioneer 6875 hybrid, under drought and high N, was lower than under drought and low N, which indicates drought tolerance, since these cultivars did not exhibit reduction in grain yield by drought, as observed for Amarelão variety, which flowered under more severe drought. 'Sol da Manhã' exhibited shorter anthesissilking interval under high N than under low N, an additional indication of tolerance.Index terms: Zea mays, drought tolerance, anthesis-silking interval. Condutância estomática em milho em condições de deficiência de água e nitrogênioResumo -O objetivo deste trabalho foi avaliar o efeito do deficit hídrico e de nitrogênio (N) sobre a condutância estomática, em três cultivares de milho cultivadas em campo. A condutância estomática da variedade Sol da Manhã (BRS 4157) e do híbrido Pioneer 6875, em condições de seca e alto teor de N, foi menor que com seca e baixo teor N, o que indica tolerância à seca, pois estas cultivares não tiveram a produção de grãos reduzida com a seca, como ocorreu com a variedade Amarelão, que floresceu sob condições de seca mais severa. 'Sol da Manhã' exibiu maior sincronia entre pendoamento e espigamento com alto teor de N do que com baixo N, o que é evidência adicional de tolerância.

The Response Of Maize (ZEA maysL.) Grain Yield to Water and Nitrogen Supply in An Eastern Croatian Environment

“…Maize responds well to different management practices, among which irrigation and nitrogen fertilization contribute significantly to maximum crop productivity, and irrigation may improve the efficiency of fertilizer utilization (Abbas et al, ). As reported by Medici et al (), when plants flowered early during drought, high N supply did mitigate the drought effect. Medici et al () emphasized a gap between research on deficit irrigation and research on well‐watered plants.…”

The effects of urea fertilisation and genotype on yield, nitrogen use efficiency, δ15N and δ13C in wheat

“…However, for well‐watered pot‐grown Coffea canephora , N application increased δ 13 C through changes in carbon assimilation with little or no effect on stomatal behaviour (DaMatta et al , 2002). Moreover, other studies show that under full irrigation, an increase in N fertiliser did not decrease stomatal conductance (Medici et al , 2007) although it reduced C i / C a (Cechin & Fumis, 2004). Our results do not allow us to ascribe the slight increase we found in δ 13 C to water stress.…”

Morpho-physiological and Biochemical Responses of Camelina (Camelina sativa crantz) Genotypes under Drought Stress

“…The decrease in photosynthesis under limited water may be due to degradation of chlorophyll, disintegration and suppression of rubisco and stomatal closure (Hajduch et al, 2001;Pietrini et al, 2003). Stomatal regulation is a vital phenomenon in plants, because it prevents both desiccation and CO 2 acquisition (Dodd, 2003;Medici et al, 2007). Closing of stomata under limited water attributed to (Maroco et al, 1997;Chaves et al, 2009).…”