Drought‐Stress Effects on Branch and Mainstem Seed Yield and Yield Components of Determinate Soybean

Frederick, James R.; Camp, C. R.; Bauer, Philip J.

doi:10.2135/cropsci2001.413759x

Cited by 184 publications

(110 citation statements)

References 15 publications

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“…Under stress, leaf area in the main stem was reduced by 10.4% as compared to the reduction of 60.1% observed in branches. Stress occurring from initial flowering to the pod filling stage might affect pod setting and yield through a reduction of the vegetative growth of branches located in the lower nodes of the main stem (Board & Harville, 1998;Linkemer et al, 1998) and good correlations have been shown between branch vegetative growth and final yield (Frederick et al, 2001).…”

Section: Resultsmentioning

confidence: 99%

Drought sress and the distribution of vegetative and reproductive traits of a bean cultivar

Barrios

Hoogenboom

NeSmith

2005

Sci. agric. (Piracicaba, Braz.)

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Soil water deficits may affect the location and pattern of flower and pod production on different stem axes of a bean plant. The objective of this study was to understand the effect of drought stress on the distribution of flowers and pods on the main stem and on branches of bean plants. The experiment was conducted in a shelter field facility. Water stress was imposed from the end of the vegetative stage to physiological maturity and soil water was measured with a neutron probe every two weeks. Formation of flowers at each node of the main stem was monitored at 44 days after planting (DAP) and formation of pods at 55DAP and 65 DAP. Dry weight of stems and leaves as well leaf area were measured during the middle of the pod filling stage (55DAP). The total number of flowers reached maxima of 32 and 44 flowers per plant for the drought and irrigated treatments, respectively. Number of flowers on branches decreased 50% in the stress treatment when compared to the control. Pod setting was also reduced on the branches of the lower nodes of the main stems. Under drought, the leaf area diminished by 60.1% and 10.4% on branches and main stem, respectively. The field drought conditions of this experiment had a greater effect on the vegetative and reproductive growth of branches as compared to the main stem affecting the final yield. Key words: dry beans, soil water, flowers, pod setting, branches STRESS HÍDRICO E A DISTRIBUIÇÃO DE CARACTERÍSTICAS VEGETATIVAS E REPRODUTIVAS DE UM CULTIVAR DE FEIJÃORESUMO: Défices de água no solo podem afetar a localização e o padrão de produção de flores e vagens em diferentes ramos de uma planta de feijão. O objetivo deste trabalho foi o de compreender o efeito do stress hídrico na distribuição de flores e de vagens no tronco principal e nos ramos de plantas de feijão. O experimento foi conduzido em ambiente controlado. O Stress hídrico foi imposto a partir do fim do estágio vegetativo até a maturidade fisiológica e a umidade do solo foi medida por meio de sondas de nêutrons à cada duas semanas. A formação de flores em cada nó do ramo principal foi monitorada aos 44 dias após semeadura (DAP), na formação de vagens aos 55 DAP e a 65 DAP. Mediu-se o peso seco de ramos e folhas, bem como área foliar, no estádio de enchimento de grãos (55 DAP). O número total de flores alcançou os máximos de 32 e 44 flores por planta para os tratamentos com stress e irrigado, respectivamente. O número de flores em ramos decresceu de 50% no tratamento de stress, em relação ao controle. O pegamento de vagens foi também reduzido nos ramos dos nós mais baixos do tronco central. Sob falta d'água a área foliar diminuiu de 60.1% a 10.4% em ramos e tronco principal, respectivamente. As condições de stress hídrico neste experimento tiveram um efeito maior nos crescimento vegetativo e reprodutivo dos ramos, em comparação com o tronco principal, afetando a produção final. Palavras-chave: feijão, água no solo, flores, pegamento de vagens, ramos

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Section: Resultsmentioning

confidence: 99%

Drought sress and the distribution of vegetative and reproductive traits of a bean cultivar

Barrios

Hoogenboom

NeSmith

2005

Sci. agric. (Piracicaba, Braz.)

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“…At the independent stage, there were more irradiances resources for use, the change of red: far red ratio maybe beneficial to soybean to form more branches. Drought stress occurring between initial flowering and seed fill decreases total seed yield primarily by reducing branch vegetative growth, which reduces branch seed number and branch seed yield (Frederick et al, 2001). …”

Section: Discussionmentioning

confidence: 99%

Effects of shade and drought stress on soybean hormones and yield of main-stem and branch

Zhang¹,

Smith²,

Liu³

et al. 2011

Afr. J. Biotechnol.

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“…Thus, under stress in the filling stage, there is greater availability of photoassimilates to the seeds produced on the main stem in detriment to those produced on the branches. Frederick et al (2001) concluded that the contribution of branches to seed productivity is highly influenced by water availability, whereas the seed production of the main stem is quite stable; thus, the contribution of the main stem for seed productivity is relatively higher in the years of drought. These factors underlie the formation of larger seeds as the density increased from 150 to 560 thousands h −1 viable seeds under the conditions of thermal and water stress during seed formation.…”

Section: Classification Of Seedsmentioning

confidence: 99%

Size, physiological quality, and green seed occurrence influenced by seeding rate in soybeans

Ferreira

Zucareli

Balbinot

et al. 2017

SCA

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The seeding rate influences the intraspecific competition, which might affect the development and quality of seeds in soybean. However, the impact of seeding rate on the physical and physiological qualities of soybean seeds needs to be better elucidated. This study aimed to evaluate the effects of soybean plant density on the seed size as well as the effects of the interaction between the plant density and seed size on the seed mass, green seed occurence, and physiological seed quality. The experiments were carried out in the growing seasons of the years 2013/14 and 2014/15 in a Latossolo Vermelho distroférrico, under a randomized complete block design, using the NK 7059 RR cultivar with six replications. Four plant densities (150, 300, 440, and 560 thousand viable seeds ha -1 ) were evaluated. After the classification of seeds into four sizes, using a set of sieves, a 4 ×4 factorial scheme was used for the statistical analysis of the four plant densities and four seed sizes. The seed samples were evaluated for the seed mass, green seed percentage, germination, and vigor. Under thermal and water stress during seed development, an increase in the seeding rate led to a reduction in the green seed occurrence and an increase in the seed size and mass. However, in the absence of thermal and water stress, the seed size and mass were not altered by the seeding rate and, there was no occurrence of green seeds. Key words: Plant density. Chlorophyll retention. Green seeds. Seed vigor. ResumoA densidade de semeadura, por influenciar na competição intraespecífica, pode afetar o desenvolvimento e a qualidade das sementes de soja produzidas. Entretanto, o impacto da densidade de semeadura sobre a qualidade física e fisiológica das sementes de soja precisa ser melhor elucidado. Objetivou-se avaliar os efeitos da densidade de semeadura sobre o tamanho das sementes produzidas e a interação entre a densidade de semeadura e o tamanho das sementes sobre a massa, a ocorrência de sementes verdes e a qualidade fisiológica das mesmas. O experimento foi conduzido nas safras 2013/14 e 2014/15, em um Latossolo Vermelho distroférrico, sob o delineamento de blocos casualizados, utilizando-se a cultivar NK7059 RR, com seis repetições. Os tratamentos consistiram de quatro densidades de semeadura (150, 300, 440 e 560 mil sementes viáveis ha -1 ). Após a classificação em peneiras das sementes produzidas, adotou-se o esquema fatorial 4 x 4, com 4 densidades e 4 tamanhos de sementes. Avaliaram-se a massa de mil sementes, porcentagem de sementes verdes, germinação e vigor. O aumento na densidade de

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Drought‐Stress Effects on Branch and Mainstem Seed Yield and Yield Components of Determinate Soybean

Cited by 184 publications

References 15 publications

Drought sress and the distribution of vegetative and reproductive traits of a bean cultivar

Drought sress and the distribution of vegetative and reproductive traits of a bean cultivar

Effects of shade and drought stress on soybean hormones and yield of main-stem and branch

Size, physiological quality, and green seed occurrence influenced by seeding rate in soybeans

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