Some Differences Between Soybean Cultivars Observed by Growth Analysis

Buttery, B. R.; Buzzell, R. I.

doi:10.4141/cjps72-002

Cited by 28 publications

(23 citation statements)

References 11 publications

(6 reference statements)

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“…There is convincing evidence, from differing experimental approaches, that increased photosynthesis increases seed yield in soybean [8,15,20,26]. The net photosynthetic rate is being widely used as a selection criterion [8, 151 . The marked response of photosynthesis to climatic factors such as irradiance and temperature raises the need to grade varieties according to their photosynthetic capacity, so that they may be used as breeding lines in improvement programs.…”

Section: Discussionmentioning

confidence: 99%

Responses of photosynthesis to irradiance and temperature in soybean, Glycine max (L.) Merr

Gourdon

Planchon

1982

Photosynth Res

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The response of photosynthesis to irradiance and temperature during growth was investigated in two soybean genotypes. Soybean is a species that can modify its structure and metabolism so as to adapt to differing light conditions; its responses to rapid changes in irradiance are characterized by their flexibility. However, the temperature during growth can change the response to irradiance: moreover, there may be a marked interaction with genotype.The response of photosynthesis to irradiance consists of changes in leaf thickness, which bring about variations in the mesophyll resistance to CO2 transfer. The increase in net photosynthesis per unit of leaf area is due to the increase in the amount of assimilating material beneath unit of area, as corroborated by the stability of the net photosynthesis per unit volume. Moreover, the response of photosynthesis to temperature is due to the mesophyll diffusion 'constant' which decreases with the growth temperature.

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Section: Discussionmentioning

confidence: 99%

Responses of photosynthesis to irradiance and temperature in soybean, Glycine max (L.) Merr

Gourdon

Planchon

1982

Photosynth Res

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“…2002 persistência. Uma menor relação parte aérea/raízes pode significar um sistema radical mais extenso e, possivelmente, mais eficiente (Buttery & Bizzell, 1972). Sob pastejo, uma proporção da parte aérea é removida, sendo o primeiro efeito a redução no crescimento radical e a redução no suprimento de carbono fixado, até que o crescimento aéreo seja retomado.…”

Section: Introductionunclassified

Alocação da biomassa e correlações morfofisiológicas em leguminosas forrageiras com hábitos de crescimento contrastantes

Scheffer-Basso

Jacques

Agnol

2002

Sci. agric. (Piracicaba, Braz.)

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4Bolsista CNPq. *Autor correspondente RESUMO: A análise da alocação da biomassa e a correlação entre variáveis morfofisiológicas permitem maior entendimento do estabelecimento, produção e persistência de espécies perenes, em trabalhos de melhoramento genético, manejo e ecologia de plantas forrageiras. Este trabalho teve o objetivo de analisar a alocação de biomassa em leguminosas forrageiras (Adesmia latifolia, A. punctata, A. tristis, Lotus corniculatus, L. uliginosus). O experimento foi conduzido em casa de vegetação durante 210 dias (4000 graus-dia); as plantas foram cultivadas em caixas de 1 m 2 . Nesse período, foram retiradas amostras periódicas para avaliação dos componentes morfológicos e descrição do hábito das espécies. A alocação da biomassa em raízes, caule e folha foi expressa em percentagem de massa seca. A maior alocação em folhas ocorreu nas espécies estoloníferas, A. latifolia (63,53%) e A. punctata (61,42%), que, por sua vez, mostraram a menor alocação em raízes, 10,90 a 14,77 %, respectivamente. Maior alocação de biomassa em caule (39,38%) e raízes (24,39%) foi verificada em L. uliginosus, espécie rizomatosa. Para todas as espécies, o índice de área foliar (IAF) esteve correlacionado positivamente com número de folhas das hastes secundárias e biomassa aérea. A. latifolia e Lotus spp. são exemplos extremos da relativa importância dos componentes morfológicos na formação do IAF e da biomassa. O padrão de acúmulo e alocação de biomassa nas leguminosas estoloníferas é caracterizado, principalmente, pela produção de folhas, indicando a importância do alongamento e enraizamento dos estolões, enquanto em A. tristis e Lotus spp., as frações caule e raízes apresentam igual importância. Palavras-chave: Adesmia, Lotus, índice de área foliar BIOMASS ALLOCATION AND MORPHOPHYSIOLOGICAL CORRELATIONS IN FORAGE LEGUMES WITH CONTRATING GROWTH HABITSABSTRACT: The biomass allocation analysis and the correlation among morphophysiological variables allow greater understanding of the establishment, yield and persistence of perennial species in plant breeding projects, management and ecology of forage plants. To analyze the biomass allocation of forage legumes (Adesmia latifolia, A. punctata, A. tristis, Lotus corniculatus, L. uliginosus), an experiment was carried out under greenhouse conditions for 210 days (4000 degree-days); the plants were cultivated in 1 m 2 wooden boxes. Plants were harvested to evaluate the morphological components and to describe their growth habit. The root, stem and leaf biomass allocations were expressed as dry mass percentages. The greatest allocation on leaves occurred for stoloniferous species, A. latifolia (63.5%) and A. punctata (61.4%), which presented the smallest allocation for roots, 10.9 and 14.7%, respectively. Largest stem biomass allocation (39.4%) and roots (24.4%) were found for L. uliginosus, a species with rhizomes. The leaf area index (LAI) was positively correlated with the number of leaves, secondary stems and aerial biomass. A. latifolia and Lotu...

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“…Results of studies looking at CER in progeny of a breeding program have also been mixed. Buttery and Buzzell (1972) determined that over 60% of cultivars developed from breeding programs had CER greater than their parent cultivars. Ojima (1972) also was successful in demonstrating increased CER in early progeny lines vs. parental cultivars.…”

Section: Genetic Strategies For Yield Improvementmentioning

confidence: 99%