scholarly journals Root Length and Vapour Pressure Deficit: Effect on Relative Water Content in Zea Mays L.

1971 ◽  
Vol 24 (3) ◽  
pp. 805 ◽  
Author(s):  
LA Downey ◽  
TC Mitchell
Keyword(s):  
Zea Mays ◽  
Water Content ◽  
Vapour Pressure ◽  
Root Length ◽  
Relative Water Content ◽  
Zea Mays L ◽  
Vapour Pressure Deficit ◽  
Personal Communication ◽  
Male Sterile ◽  
Relative Water

The pair of lodicules situated at the base of the ovary and adjacent to the lemma of the wheat floret have long been known to be involved in the opening of the wheat floret at anthesis (see Arber 1965). At anthesis, the lodicules swell and force the lemma away from the palea, allowing the stamens to grow out from the floret. Some minutes later and presumably in response to a stimulus associated with pollination (male-sterile florets may remain open for many hours: Dr. A. T. Pugsley, personal communication) the lodicules collapse and the floret closes. We are studying the events which lead to this rapid swelling and degeneration of the lodicule in wheat and noticed that information about the nature of the vascular tissues in lodicules is very meagre.

scholarly journals ÉPOCAS DE SEMEADURA DE MILHO NA REGIÃO NORTE DE MATO GROSSO

Nativa ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 241
Author(s):  
Cassiano Spaziani Pereira ◽  
Ezequel Giese ◽  
Ivan Vilela Andrade Fiorini ◽  
Anderson Lange
Keyword(s):  
Zea Mays ◽  
Water Content ◽  
Leaf Area ◽  
Relative Water Content ◽  
Dry Matter ◽  
Zea Mays L ◽  
Block Design ◽  
Mato Grosso ◽  
The North ◽  
Relative Water

Existem poucas informações sobre a melhor época de semeadura de milho, durante o período da “segunda safra” no norte de Mato Grosso. O objetivo do trabalho foi verificar o comportamento produtivo de três híbridos de milho, semeados em seis épocas, durante a “segunda safra,” ou “safrinha”, no norte de Mato Grosso, Sinop-MT. O experimento foi conduzido em um Latossolo Vermelho Amarelo distrófico típico argiloso, entre janeiro e julho de 2014. O delineamento experimental foi em blocos ao acaso, com quatro repetições em esquema fatorial 3 x 6. Utilizou-se três híbridos comerciais simples e “precoces”: Maximus®; Truck (Syn7316)® e Status (Syn7205)®. As épocas de semeadura ocorreram aos 0, 7, 14, 21, 28 e 35 Dias após a semeadura de 26/01, correspondendo as datas de 26/01; 02/02; 09/02; 16/02; 23/02 e 02/03 de 2014, respectivamente. Avaliou-se a altura de plantas, área foliar, massa seca, teor relativo de água e produtividade da cultura. No florescimento, os menores teores de água nas folhas ocorreram nas plantas semeadas entre os dias 16/02 e 23/02. O crescimento vegetativo do milho foi o menor na época de semeadura entre os dias 09/02 a 23/02. Os híbridos Truck®, Máximus® e Status® não apresentaram diferença de produtividade e são mais produtivos quando semeados no final do período de segunda safra, entre os dias 16/02 a 02/03.Palavras-chave: Zea mays L, milho segunda safra, matéria seca, área foliar, teor relativo de água. MAIZE SEED TIMES IN THE NORTH REGION OF MATO GROSSO ABSTRACT:Were not sufficient information’s about the best time sowing of corn crop, during period of maize off-season in the north of Mato Grosso. The objective of this work was to verify the productive behavior of three maize hybrids, sown in six seasons, during the "second harvest," in the north of Mato Grosso, Sinop-MT. The experiment was conducted in a typical clayey dystrophic Yellow Red Latosol between January and July 2014. The experimental design was a randomized complete block design with four replicates in a 3 x 6 factorial scheme. Three commercial hybrids were used: Maximus®; Truck (Syn7316) ® and Status (Syn7205) ®. Sowing times occurred on day after sowing of date based of 01/26; respectively for datas: 01/26; 02/02; 09/02; 16/02; 23/02 and 02/03 of 2014. The variables analyzed the height of plants, stem diameter, leaf area, dry matter, relative water content and crop productivity were evaluated. At flowering, the lowest leaf water contents occurred in the plants sown between February 16 and February 23. The maize vegetative growth was the lowest in the sowing season between 09/02 to 23/02. The Hybrids Truck, Maxima and Status had a productivity difference and are more productive when sown at the end of the second crop period, between February 16 to March 2.Keywords: Zea mays L., maize off-season, dry matter, leaf area, relative water content. DOI:

The Growth of Banana Plants in Relation to Temperature

1983 ◽  
Vol 10 (1) ◽  
pp. 43 ◽  
Author(s):  
DW Turner ◽  
E Lahav
Keyword(s):  
Water Content ◽  
Leaf Area ◽  
High Temperatures ◽  
Relative Water Content ◽  
Chilling Injury ◽  
Vapour Pressure Deficit ◽  
Dry Weight ◽  
Unit Leaf ◽  
Whole Plant ◽  
Relative Water

Bananas (cv. Williams) were grown for 12 weeks in sunlit growth chambers at day/night temperatures of 17/10, 21/14, 25/18, 29/22, 33/26 or 37/30°C. Humidity was not controlled. At 17/10°C, the plants showed chilling injury and heat injury occurred at 37/30°C. Total plant dry weight was greatest at 25/18°C while leaf area was greatest at 33/26°C. At high temperatures proportionately less dry matter was present in the roots and corm compared with plants at 25/18°C. High temperatures produced more horizontal leaves but, to compensate for this, the laminae folded more readily. Lamina folding was closely associated with relative water content of the laminae, except under cool conditions where laminae folded despite high (97-99%) leaf relative water contents. Unit leaf rate (increase in whole plant dry weight per unit leaf area per unit time) was greatest at 21/14°C (5.8 g m-2 day-1) and least at 37/30°C (1.7 g m-2 day-1.) and had a strong negative association with whole-plant leaf resistance. Leaf relative water content was more closely associated with vapour pressure deficit than temperature and even at 37/30°C was high at 94%.

scholarly journals Transpiration Capacity in Poinsettia Cuttings at Different Rooting Stages and the Development of a Cutting Coefficient for Scheduling Mist

2005 ◽  
Vol 130 (3) ◽  
pp. 295-301 ◽  
Author(s):  
Erin G. Wilkerson ◽  
Richard S. Gates ◽  
Sérgio Zolnier ◽  
Sharon T. Kester ◽  
Robert L. Geneve
Keyword(s):  
Water Content ◽  
Root Length ◽  
Relative Water Content ◽  
Dynamic Control ◽  
Elemental Content ◽  
Euphorbia Pulcherrima ◽  
Total Root Length ◽  
Foliar Nutrition ◽  
Before And After ◽  
Relative Water

Rooting stage, transpiration capacity, and relative water content were measured in cuttings every 5 days for 25 days. Cell divisions in phloem parenchyma were evident between 5 and 10 days after sticking, organized subcuticular root primordia were present between 10 and 12 days, and roots emerged between 12 and 15 days. Transpiration was measured in poinsettia (Euphorbia pulcherrima Willd. ex Klotzsch `Freedom Dark Red') cuttings under light or dark conditions at increasing vapor pressure deficit (VPDair) levels during different stages of rooting. Transpiration capacity did not increase until roots emerged on the cuttings. Light had a significant impact on transpiration rates only after roots emerged. Light was more significant than VPDair for determining actual transpiration. Between visible rooting (15 days) and 25 days, increase in total root length was linear (r2 = 0.92) and significantly correlated with transpiration (r2 = 0.98). Transpiration capacity increased after visible rooting, but did not significantly increase under non-misted conditions until cuttings were well-rooted and had a total root length >50 cm (18 days after sticking). Relative water content measured before and after entering the transpiration chamber confirmed that cuttings were only able to take enough water from the medium to continue sustained transpiration after 18 days. A cutting coefficient was developed from transpiration data to modify the misting interval for dynamic controlled misting. Greenhouse studies showed a 55% or greater reduction in water use with dynamic control compared to constant static or stepped down static control. Rooting performance was unaffected by misting interval. Foliar nutrition was significantly reduced in all cuttings after 7 days in the mist bench, but changes in foliar elemental content were not correlated with misting interval.

scholarly journals Physiological responses of Eucalyptus urophylla young plants treated with biostimulant under water deficit

2019 ◽  
Vol 29 (3) ◽  
pp. 1072
Author(s):  
Rayka Kristian Alves Santos ◽  
Paulo Araquém Ramos Cairo ◽  
Romário Pereira Barbosa ◽  
Janderson De Jesus Lacerda ◽  
Caio Da Silva Mafra Neto ◽  
...  
Keyword(s):  
Plant Growth ◽  
Water Content ◽  
Root Length ◽  
Relative Water Content ◽  
Physiological Responses ◽  
Net Photosynthesis ◽  
Eucalyptus Urophylla ◽  
Main Root ◽  
Hormonal Balance ◽  
Relative Water

Biostimulants consist of a mixture of growth regulators that, when they are sprayed on plants, act on hormonal balance, enhancing its development. Stimulate® is a biostimulant composed by indole butyric acid (0.005%), kinetin (0.009%) and gibberellic acid (0.005%) which promotes root growth, improves water and nutrients uptake, and helps restore plant hormonal balance. This research was based on the hypothesis that Stimulate® spraying can be an alternate way to mitigate negative effects of soil water-limiting on plant growth. The experimental work was performed in greenhouse and aimed to evaluate physiological responses of young plants of Eucalyptus urophylla sprayed with different Stimulate® concentrations and submitted to the following irrigation regimes: full, partial and no irrigation. Leaf water potential, relative water content, net photosynthesis, plant height and main root length were measured. Under water-limited conditions, plants sprayed with Stimulate® showed higher net photosynthesis and relative water content had a less decrease, due to osmotic adjustment. Spraying with Stimulate® also provided greater plant height and longer main root length in plants under water deficit. We conclude that the use of Stimulate® can be a viable option to mitigate negative water stress physiological effects in young plants of Eucalyptus urophylla, helping to partially maintain the plant growth under water-limited conditions.

The Method of Plant Water Status Measurement in Sweet Potato (Ipomoea Batatas (L) Lam.)

2010 ◽  
Vol 7 (1) ◽  
Author(s):  
Saraswati Prabawardani
Keyword(s):  
Water Content ◽  
Sweet Potato ◽  
Relative Water Content ◽  
Water Status ◽  
Plant Water Status ◽  
Equilibration Time ◽  
Plant Water ◽  
Font Size ◽  
Potato Leaf ◽  
Relative Water

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Palmer Amaranth (Amaranthus palmeri) Competition for Water in Cotton

Weed Science ◽  
2015 ◽  
Vol 63 (4) ◽  
pp. 928-935 ◽  
Author(s):  
Sarah T. Berger ◽  
Jason A. Ferrell ◽  
Diane L. Rowland ◽  
Theodore M. Webster
Keyword(s):  
Water Content ◽  
Relative Water Content ◽  
Yield Loss ◽  
Linear Trend ◽  
Palmer Amaranth ◽  
Cotton Production ◽  
Excess Water ◽  
Relative Water ◽  
Competition For Light ◽  
Daily Water

Palmer amaranth is a troublesome weed in cotton production. Yield losses of 65% have been reported from season-long Palmer amaranth competition with cotton. To determine whether water is a factor in this system, experiments were conduced in 2011, 2012, and 2013 in Citra, FL, and in Tifton, GA. In 2011, infrequent rainfall lead to drought stress. The presence of Palmer amaranth resulted in decreased soil relative water content up to 1 m in depth. Cotton stomatal conductance (gs) was reduced up to 1.8 m from a Palmer amaranth plant. In 2012 and 2013 higher than average rainfall resulted in excess water throughout the growing season. In this situation, no differences were found in soil relative water content or cottongsas a function of proximity to Palmer amaranth. A positive linear trend was found in cotton photosynthesis and yield; each parameter increased as distance from Palmer amaranth increased. Even in these well-watered conditions, daily water use of Palmer amaranth was considerably higher than that of cotton, at 1.2 and 0.49 g H20 cm−2d−1, respectively. Although Palmer amaranth removed more water from the soil profile, rainfall was adequate to replenish the profile in 2 of the 3 yr of this study. However, yield loss due to Palmer amaranth was still observed despite no change ings, indicating other factors, such as competition for light or response to neighboring plants during development, are driving yield loss.

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