Abscisic acid is correlated with the leaf growth inhibition of four genotypes of maize differing in their response to salinity

2002 ◽  
Vol 29 (1) ◽  
pp. 111 ◽  
Author(s):  
Grant R. Cramer ◽  
Steve A. Quarrie
Keyword(s):  
Zea Mays ◽  
Abscisic Acid ◽  
Zea Mays L ◽  
Leaf Growth ◽  
Elongation Rate ◽  
Growth Reduction ◽  
Leaf Elongation ◽  
Maize Genotypes ◽  
Leaf Elongation Rate ◽  
Highly Correlated

In this paper we tested the hypothesis that the leaf growth reduction of salt-stressed maize is regulated by the abscisic acid (ABA) concentrations in the growing zone of the leaf. Leaf elongation rate (LER) of maize (Zea mays L.) was rapidly inhibited by salinity (80 mM NaCl), and the (+)-ABA concentration increased significantly in the growing zone of the leaf. Upon removal of salinity, ABA concentrations decreased rapidly in the growing zone and LER increased to control levels. Four maize genotypes differing in their responses to salinity were compared over a range of leaf ABA concentrations. (+)-ABA concentrations in the growing zone of the leaf were highly correlated with LER inhibition for all four genotypes. However, the sensitivity of LER to leaf ABA concentrations differed amongst the genotypes. Thus, for each genotype, ABA concentrations in the growing zone of the leaf were a good predictor of maize LER response to salinity.

Corrigendum to: Abscisic acid is correlated with the leaf growth inhibition of four genotypes of maize differing in their response to salinity

2002 ◽  
Vol 29 (4) ◽  
pp. 535 ◽  
Author(s):  
Grant R. Cramer ◽  
Steve A. Quarrie
Keyword(s):  
Zea Mays ◽  
Abscisic Acid ◽  
Zea Mays L ◽  
Leaf Growth ◽  
Elongation Rate ◽  
Growth Reduction ◽  
Leaf Elongation ◽  
Maize Genotypes ◽  
Leaf Elongation Rate ◽  
Highly Correlated

In this paper we tested the hypothesis that the leaf growth reduction of salt-stressed maize is regulated by the abscisic acid (ABA) concentrations in the growing zone of the leaf. Leaf elongation rate (LER) of maize (Zea mays L.) was rapidly inhibited by salinity (80 mM NaCl), and the (+)-ABA concentration increased significantly in the growing zone of the leaf. Upon removal of salinity, ABA concentrations decreased rapidly in the growing zone and LER increased to control levels. Four maize genotypes differing in their responses to salinity were compared over a range of leaf ABA concentrations. (+)-ABA concentrations in the growing zone of the leaf were highly correlated with LER inhibition for all four genotypes. However, the sensitivity of LER to leaf ABA concentrations differed amongst the genotypes. Thus, for each genotype, ABA concentrations in the growing zone of the leaf were a good predictor of maize LER response to salinity.

Rapid environmental changes that affect leaf water status induce transient surges or pauses in leaf expansion rate.

2000 ◽  
Vol 27 (10) ◽  
pp. 941 ◽  
Author(s):  
John B. Passioura ◽  
Rana Munns
Keyword(s):  
Environmental Changes ◽  
Leaf Growth ◽  
Water Status ◽  
Recovery Phase ◽  
Elongation Rate ◽  
Leaf Water ◽  
Leaf Elongation ◽  
Initial Value ◽  
Leaf Water Status ◽  
Leaf Elongation Rate

We subjected wheat and barley plants to rapid environmental changes, and monitored leaf elongation rates for several hours thereafter. Changes in light, humidity or salinity caused sudden rises (if the leaf water status rose) or falls (if the leaf water status fell) in leaf elongation rate, followed by a recovery phase that lasted 20–60 min. After a step change in light or humidity, the growing leaf eventually resumed its original elongation rate, although the shoot water status, as monitored by leaf thickness, differed markedly. Salinity, on the other hand, produced a persistent change in leaf elongation rate, which settled down to a lower steady rate after the transient response was over. To determine whether the sudden changes in leaf elongation rate were due to changes in leaf water relations, we kept shoots fully hydrated through the environmental changes by automatically pressurising the roots to maintain leaf xylem on the point of bleeding. This annulled the environmental effects on leaf water status, and thereby largely removed the changes in leaf elongation rate. The only exception was at the dark:light transition, when the leaf elongation rate of pressurised plants rose sharply (in contrast to that of unpressurised plants, which fell), then underwent damped oscillations before settling at about its initial value. The sudden excursions of leaf growth in unpressurised plants accompanying the environmental changes were undoubtedly due to changes in leaf water status. The subsequent, generally complete, return of the leaf elongation rate to its initial value within an hour, despite the persistent change in leaf water status, suggests that a control system is operating at a time scale of tens of minutes that eventually overrides, partially or completely, the rapid effects of changes in leaf water status.

scholarly journals Morphogenetic characteristics of three Brachiaria brizantha cultivars submitted to nitrogen fertilization

2013 ◽  
Vol 85 (1) ◽  
pp. 371-377 ◽  
Author(s):  
Marcos F Silva ◽  
Edson M. V Porto ◽  
Dorismar D Alves ◽  
Cláudio M.T Vitor ◽  
Ignacio Aspiazú
Keyword(s):  
Nitrogen Fertilization ◽  
Leaf Blade ◽  
Elongation Rate ◽  
Leaf Elongation ◽  
Brachiaria Brizantha ◽  
Nitrogen Levels ◽  
Appearance Rate ◽  
Leaf Elongation Rate ◽  
Leaf Appearance Rate ◽  
Leaf Appearance

This study aims to evaluate the morphogenetic characteristics of three cultivars of Brachiaria brizantha subjected to nitrogen fertilization. The design was a randomized block in factorial arrangement 4x3; three cultivars of B. brizantha - Marandu, Piatã, Xaraés and four nitrogen levels - 0, 80, 160 and 240 kg/ha, with three replications. The experimental units consisted of plastic pots filled with 5 dm3 of soil. Thereupon the establishment fertilization, varieties were sowed directly in the pots, leaving, after thinning, five plants per pot. Forty-five days after planting, it was done a standardization cut at 10 cm tall. Nitrogen levels were distributed according to the treatments, divided in three applications. The morphogenetic characteristics were evaluated in three tillers per sampling unit and data were submitted to analysis of variance and regression. For all evaluated characteristics there was no interaction between factors cultivar and nitrogen levels, verifying only the effects of nitrogen on the variables leaf appearance rate and phyllochron. The dose 240 kg/ha of N corresponds to the greater leaf appearance rate. Cultivar Marandu shows the higher leaf blade: pseudostem and ratio of leaf elongation rate and elongation pseudostem, which favors higher forage quality.

scholarly journals Genetic Variability of Maize (Zea mays L.) Genotypes on Some Yield and Yield Components at Haramaya, Eastern Ethiopia

2020 ◽  
Vol 8 (9) ◽  
pp. 1840-1845
Author(s):  
Mekuannet Belay Kebede ◽  
Degefa Gebissa
Keyword(s):  
Zea Mays ◽  
Genetic Variability ◽  
Zea Mays L ◽  
Genotype 1 ◽  
Eastern Ethiopia ◽  
Maize Production ◽  
Maize Genotypes ◽  
Coefficients Of Variation ◽  
Study Results ◽  
Almost All

Genetic improvement in components of economic importance along with maintaining a sufficient amount of variability is always the desired objective in the any maize (Zea mays L.) breeding program which will be handled under the conditions of Haramaya, Eastern Ethiopia. Therefore, an experiment was conducted using (27) and (3) check/control varieties to determine the genetic variability of maize genotypes at Haramaya, eastern Ethiopia. The study results revealed that significantly the tallest plant heights for (PH) were recorded from (3) (170 cm) and (18) (167.5 cm) genotypes whereas the shortest PH were recorded from (13) (117.5 cm) and (23) genotypes (120 cm). Good plant aspects (PA) were obtained from genotype 12, 22 and 26 (PA-1.5) and poor PA were attained from genotype 1 (PA-2.5). Besides, genetic and phenotypic variances were estimated for seven components. The highest genotypic coefficients variation (GCV) and phenotypic coefficients of variation (PCV) were calculated from grain yield (GY – 23.39%). Comparatively the higher GY were attained from the genotypes of 3, 9 and 12. It can be concluded that almost all components of the PCV are greater than the GCV. Superior selected genotypes are recommended to the researchers /breeders to develop disease resistant and high yielder varieties to increase maize production by farmers under Haramaya and other similar agroecologies.

scholarly journals MORFOLOGIA FOLIAR DE SORGO SACARINO CULTIVADO EM DIFERENTES ESPAÇAMENTOS ENTRELINHAS E ÉPOCAS DE SEMEADURA

2018 ◽  
Vol 17 (1) ◽  
pp. 63
Author(s):  
ANDRIELI HEDLUND BANDEIRA ◽  
SANDRO LUIS PETTER MEDEIROS ◽  
BEATRIZ MARTI EMYGDIO ◽  
JEAN CECCHIM BIONDO ◽  
LINEU TRINDADE LEAL
Keyword(s):  
Sorghum Bicolor ◽  
Sweet Sorghum ◽  
Block Design ◽  
Shoot Elongation ◽  
Elongation Rate ◽  
Leaf Elongation ◽  
Sowing Time ◽  
Leaf Elongation Rate ◽  
Line Spacing ◽  
Sorghum Genotypes

RESUMO - O objetivo deste trabalho foi avaliar as características morfogênicas do colmo principal de genótipos de sorgo sacarino, em diferentes espaçamentos entrelinhas e épocas de semeadura. O experimento foi conduzido em Santa Maria-RS, em delineamento experimental de blocos ao acaso em esquema trifatorial (2x2x3), com dois genótipos de sorgo sacarino (BRS 506 e Fepagro 19), dois espaçamentos entrelinhas (0,50 m e 0,70 m) e três épocas de semeadura (outubro, novembro e dezembro), quatro repetições e dois anos de cultivo. Foram avaliadas a taxa de alongamento das folhas, o número final de folhas no colmo, a taxa de surgimento de folha, filocrono e taxa de elongamento de colmo. As variáveis não apresentaram interação tripla significativa entre genótipo, espaçamento de entrelinhas e época de semeadura. O genótipo BRS 506 apresentou número de folhas acumuladas, taxa de alongamento de folhas nas épocas de semeaduras constante. O atraso na época de semeadura resulta em menor número de folhas acumuladas e taxa de elongação do colmo para o Fepagro 19. O filocrono para o espaçamento entrelinhas 0,70 m é inferior ao de 0,50 m. Os genótipos estudados estão aptos para a produção na região, desde que a semeadura ocorra no mês de outubro. Palavras-chave: alongamento foliar, filocrono, graus-dia, índice Haun, Sorghum bicolor. LEAF MORPHOLOGY OF SWEET SORGHUM CULTIVATED IN DIFFERENT ROW SPACINGS AND SOWING DATES ABSTRACT - The objective of this work was to evaluate the morphogenic characteristics of the main stem of sweet sorghum genotypes in different spacing between lines and sowing times. The experimental was carried out in a randomized complete block design in a trifactorial scheme (2x2x3), with two sweet sorghum (BRS 506 and Fepagro 19), two spacing between lines (0.50 m and 0.70 m) and three sowing seasons (October, November and December), four replications and two years of cultivation. The leaf elongation rate, the final number of leaves in the stem, the leaf appearance rate, phyllochron and shoot elongation rate were evaluated. The variables did not present significant triple interaction between genotype, spacing between rows and sowing time. The genotype BRS 506 presented a number of accumulated leaves, leaf elongation rate at constant sowing times. The delay in sowing seasons results in a lower number of accumulated leaves and the elongation rate of the stem for genotype Fepagro 19. The phyllochron for the 0.70 m line spacing is less than 0.50 m. The genotypes studied are suitable for production in the region, as long as sowing occurs in October.Keywords: leaf elongation, phyllochron, degree-days, Haun index, Sorghum bicolor.

Chlorophyll content and leaf elongation rate in wheat seedlings as a measure of manganese tolerance

1991 ◽  
Vol 136 (1) ◽  
pp. 1-9 ◽  
Author(s):  
J. S. Moroni ◽  
K. G. Briggs ◽  
G. J. Taylor
Keyword(s):  
Chlorophyll Content ◽  
Elongation Rate ◽  
Leaf Elongation ◽  
Wheat Seedlings ◽  
Manganese Tolerance ◽  
Leaf Elongation Rate

Comparative Proteomic Analysis of the Effects of Salicylic Acid and Abscisic Acid on Maize (Zea mays L.) Leaves

2012 ◽  
Vol 31 (3) ◽  
pp. 507-516 ◽  
Author(s):  
Liuji Wu ◽  
Xiaofeng Zu ◽  
Xintao Wang ◽  
Anguo Sun ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Zea Mays ◽  
Salicylic Acid ◽  
Abscisic Acid ◽  
Proteomic Analysis ◽  
Zea Mays L ◽  
Comparative Proteomic Analysis

Abscisic acid and the response of the roots of Zea mays L. seedlings to gravity

Planta ◽  
1975 ◽  
Vol 126 (1) ◽  
pp. 19-23 ◽  
Author(s):  
Henry Wilkins ◽  
R. L. Wain
Keyword(s):  
Zea Mays ◽  
Abscisic Acid ◽  
Zea Mays L
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