The Physiology of Plant Growth with Special Reference to the Concept of Net Assimilation Rate

Williams, RF

doi:10.1093/oxfordjournals.aob.a083119

Cited by 266 publications

(137 citation statements)

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“…Rw assemelha-se ao comportamento da curva de razão de área foliar (Fa), pois tanto Rw quanto Fa apresentam tendência ao decréscimo com a ontogenia das plantas (Hunt & Loomis, 1979). O decréscimo de Rw com a idade das plantas, em parte, é resultado do acúmulo gradativo de tecidos não-assimilatórios (Williams, 1946). Dia s a p ó s se m e a du ra T a x a cre scim e n to re la tivo (g g n.s.…”

Section: Resultsunclassified

Análise de crescimento de biótipos de amendoim-bravo (Euphorbia heterophylla) resistente e suscetível aos herbicidas inibidores da ALS

et al. 2001

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RESUMO -A aplicação contínua de herbicidas do grupo químico das imidazolinonas, nas mesmas áreas de produção de soja, durante anos seguidos, no município de Cafelândia, PR, favoreceu a seleção de um biótipo resistente de amendoim-bravo (Euphorbia heterophylla) aos herbicidas inibidores da acetolactato sintase (ALS). Um estudo comparativo das características do crescimento do biótipo resistente e do suscetível foi realizado em casa de vegetação da Embrapa Soja, Londrina-PR, a fim de identificar diferenças no crescimento e no desenvolvimento das plantas e de seus órgãos. A produção de matéria seca total, a área foliar, a matéria seca dos caule, das raízes e das folhas, bem como a altura por planta, foram avaliadas em 13 vezes a intervalos regulares, iniciando aos 14 dias após a semeadura. A partir desses parâmetros, foram calculadas a taxa de crescimento relativo, a taxa assimilatória líquida, a razão de área foliar, a razão de peso foliar e a área foliar específica, que decrescem com a ontogenia das plantas de amendoim-bravo, sendo similares para ambos os biótipos. A matéria seca total acumulada pelas plantas e seus órgãos, a área foliar e a altura apresentaram comportamentos semelhantes para os biótipos resistente e suscetível. O ciclo vegetativo dos dois biótipos estudados não mostrou diferença significativa quanto ao crescimento e ao desenvolvimento.Palavras-chave: resistência a herbicidas, área foliar, taxa de crescimento. Cafelândia, Paraná, Brazil, has ABSTRACT -Repetitive spraying of imidazolinone herbicides year after year to control weeds in the soybean grown areas of

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Section: Resultsunclassified

Análise de crescimento de biótipos de amendoim-bravo (Euphorbia heterophylla) resistente e suscetível aos herbicidas inibidores da ALS

et al. 2001

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“…The leaf area was determined by the method of Sawada et al (1986). The NAR, change in dry weight per a unit leaf area and day, was calculated according to Williams (1946) . The photosynthetic and respiratory CO 2 exchanges in the rooted leaves grown in each pot were determined by infrared gas analysis according to Sawada and Sugai ( 1984).…”

Section: -S --33 51mentioning

confidence: 99%

Feed-Forward Effects on the Photosynthetic Source-Sink Balance in Single-Rooted Leaves of Sweet Potato

Sawada

Sakai

Sano

1999

Plant Production Science

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“…Derived growth functions were calculated from the treatment means. The use and derivation of growth functions in the analysis of plant growth has been described earlier (Williams 1946;Bouma 1967). The symbols used are as follows:…”

Section: (A) Generalmentioning

confidence: 99%

Effects of Changes in Boron Nutrition on Growth and Development of Subterranean Clover

Bouma¹

1969

Aust. Jnl. Of Bio. Sci.

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SummaryIn the early stages, boron deficiency had little effect on dry matter accumulation by the plant as a whole. Root growth, however, declined significantly and this was accompanied by an accumulation of dry matter in the leaves. At progressive stages of boron deficiency distribution of dry matter to new leaf tissue also became restricted. When plants already deficient in boron were transferred to solutions without boron, increases in dry weight of existing leaves were greater than for the corresponding plants transferred to complete solutions. However, the dry weight of leaves formed after the transfer increased at a much slower rate in the no-boron than in the complete solutions_ Growth responses after removal of a boron stress were characterized by a preferential distribution of assimilates to the roots.It is suggested that the changes in dry matter distribution reflected differences in demand for assimilates by new growth as a result of the effect of boron on meristematic activity.A decline in net assimilation rates at progressive stages of boron deficiency is thought to be a secondary effect following the accumulation of assimilates in the leaves.

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The Physiology of Plant Growth with Special Reference to the Concept of Net Assimilation Rate

Cited by 266 publications

References 0 publications

Análise de crescimento de biótipos de amendoim-bravo (Euphorbia heterophylla) resistente e suscetível aos herbicidas inibidores da ALS

Análise de crescimento de biótipos de amendoim-bravo (Euphorbia heterophylla) resistente e suscetível aos herbicidas inibidores da ALS

Feed-Forward Effects on the Photosynthetic Source-Sink Balance in Single-Rooted Leaves of Sweet Potato

Effects of Changes in Boron Nutrition on Growth and Development of Subterranean Clover

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