Sistema vascular e controle do desenvolvimento de perfilhos em cereais de estação fria

Alves, Antônio Carlos; Mundstock, Cláudio Mário; Medeiros, João de Deus

doi:10.1590/s0100-84042000000100007

Cited by 10 publications

(17 citation statements)

References 22 publications

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“…The small impact of cutting the third leaf on tiller number demonstrates that T1 and T2 definition and emission precedes the expansion of the third leaf, as it has also been shown by Alves et al (2000) and Almeida et al (2000). Sometimes, the same defoliation treatment had different effects on the cultivar tillering pattern, depending on the parameter that is being evaluated.…”

Section: Resultssupporting

confidence: 63%

“…Tiller emission and survival of Brazilian wheat cultivars is low under field conditions (Alves et al, 2000). Only high input crops produce more than 300 spikes m -2 at harvesting.…”

Section: Introductionmentioning

confidence: 95%

“…Experiments carried out by Alves et al (2000) and Almeida et al (2000) tiller initiation and emission can occur very early in the crop ontogeny, between the emission of the second and the fourth leaves. Evenness in plant emergence may enhance tiller production, survival and contribute to grain yield.…”

Section: Introductionmentioning

confidence: 96%

“…Reductions in the photosyntetically active surface may restrict carbohydrate availability to sustain tiller production. Alves et al (2000), working with isolated wheat, oat and barley plants, noticed that cutting one of the first four leaves of the main stem did not interfere with tiller emergence. This indicates that leaf area reduction was not limiting to tillering in a low competition environment.…”

Section: Introductionmentioning

confidence: 99%

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Tiller emission and dry mass accumulation of wheat cultivars under stress

Almeida

Sangoi

Merotto

et al. 2004

Sci. agric. (Piracicaba, Braz.)

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Tillers are important structures for wheat (Triticum aestivum L.) because they contribute to increase the number of spikes per area, enhancing grain yield. Stresses during plants early growth have a sizable effect on tiller production. Three experiments were conducted to evaluate the effects of stresses induced by unevenness in sowing depth, defoliation and differences in soil pH on tiller emission and dry mass accumulation of wheat cultivars. The experiments were carried out in Lages, Southern Brazil, during the winter growing seasons of 2000 and 2001. They were performed in square boxes, under natural conditions of radiation and irrigation. In the first experiment, five types of sowing depths were tested to simulate different systems of unevenness in plant emergence of cultivar Embrapa 16. In the second experiment, two wheat cultivars (BRS 177 and BRS 179) were submitted to four types of main stem defoliation. The third experiment assessed the effects of three levels of soil acidity correction on the tillering pattern of Fundacep 29. Unevenness in sowing depth, alternating pairs of seeds at 3 cm and 5 cm deep, reduced tiller emission and dry mass accumulation. The removal of the first and second main stem leaves reduced significantly BRS 179 tiller dry mass and number and did not affect the tillering pattern of BRS 177. The lack of liming restricted tiller emission and reduced plant dry mass accumulation.

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Section: Resultssupporting

confidence: 63%

“…Tiller emission and survival of Brazilian wheat cultivars is low under field conditions (Alves et al, 2000). Only high input crops produce more than 300 spikes m -2 at harvesting.…”

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tiller emission and dry mass accumulation of wheat cultivars under stress

Almeida

Sangoi

Merotto

et al. 2004

Sci. agric. (Piracicaba, Braz.)

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“…Foram preparados 0,18 m 3 de substrato, composto de solo, areia e esterco curtido de galinha na proporção 3:2:1 em volume. A este substrato foram adicionados fertilizantes químicos nas quantidades de: 20 g de sulfato de amônio, 10 g de fosfato de cálcio e 20 g de cloreto de potássio (Alves et al 2000).…”

Section: Methodsunclassified

Desenvolvimento reprodutivo de Hyptis suaveolens (L.) Poit.: relação entre fotoperíodo, densidade celular meristemática e padrão de expressão de um ortólogo putativo do gene LEAFY de arabidopsis

Martins¹,

Polo²

2009

Rev. bras. Bot.

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-(Reproductive development of Hyptis suaveolens (L.) Poit.: relationship among photoperiod, meristem cell density and expression pattern of a putative arabidopsis gene LEAFY ortholog). Hyptis suaveolens (L.) Poit. (Lamiaceae) is a typical invasive plant that produces an essential oil with several biological properties. The largest essential oil content is found at the flowers. So, advances in the current knowledge about the H. suaveolens reproductive development are important when the essential oil productivity is sought. Furthermore, the comprehension of the mechanisms involved in the H. suaveolens floral induction would be useful to clarify the adaptive responses in invasive plants. We here reported some H. suaveolens reproductive development features. The plants were grown at two photoperiodic treatments (natural photoperiod from Alfenas, Minas Gerais, Brazil and natural photoperiod extended of 16 h). Samples of floral and vegetative aerial apices were taken at five different periods of time, for anatomical and scanning electron microscopic analysis, as well as in situ hybridization experiments, in order to detect the transcripts of a putative ortholog of Arabidopsis thaliana LEAFY gene. Hyptis suaveolens is a short day plant, with critical photoperiod nearby 13 h. The cell density has increased according to higher vegetative or floral meristem activities. The putative ortholog of LEAFY in H. suaveolens has shown an expression pattern similar to that reported in Antirrhinum and Arabidopsis, although it was also expressed in vegetative apices at the natural photoperiod plants. Nevertheless, under extended natural photoperiod (16 h) no gene expression was detected in vegetative meristem. These results suggest a basal expression of LEAFY in H. suaveolens vegetative meristem, which is strongly decreased by extended day length conditions, or is increased under photoperiods lower than 13 h, when suitable levels are reached for floral determination.Key words -expression pattern, gene LEAFY, Hyptis suaveolens, invasive plant, Lamiaceae RESUMO -(Desenvolvimento reprodutivo de Hyptis suaveolens (L.) Poit.: relação entre fotoperíodo, densidade celular meristemática e padrão de expressão de um ortólogo putativo do gene LEAFY de arabidopsis). Hyptis suaveolens (L.) Poit. é uma planta da família Lamiaceae, considerada uma espécie tipicamente invasora. Entretanto, é produtora de óleo essencial, ao qual várias atividades biológicas são atribuídas. Informações sobre o desenvolvimento reprodutivo nesta espécie seriam úteis à elucidação de mecanismos adaptativos relacionados à indução floral em espécies invasoras, e ao incremento na produção de óleo essencial, devido sua preponderância nas flores. Assim, aqui caracterizamos alguns aspectos do desenvolvimento reprodutivo em Hyptis suaveolens. Plantas de H. suaveolens foram submetidas a dois tratamentos fotoperiódicos (fotoperíodo natural de Alfenas e fotoperíodo mínimo de 16 h) para amostragem de ápices aéreos vegetativos e florais em cinco datas. Nestes materiais botân...

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Role of nonproductive tillers as transient sinks of assimilates in wheat

et al. 2020

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Although source-sink relationships in wheat are well studied, the performance of tillers as transient sinks is still unclear, especially under stress conditions. Thus, this work aimed to study the yield relationships of wheat stems in contrasting genotypes as affected by tiller treatment under stress conditions. Two experiments were conducted under greenhouse conditions using BRS Guamirim (high tillering) and BRS Parrudo (low tillering) wheat cultivars. Four tillering treatments were applied on late tillers in the first growing season (2016) and three in the second (2017): (i) free-tillering, (ii) detillering, (iii) physical suppression (only in the first season) and (iv) "spikes removal". The main stem and the first four emitted tillers were considered as primary tillers. Plants were submitted to drought (2016) and defoliation stress (2017) at preanthesis. Intraspecific competition among tillers increased under drought stress conditions and decreased the plant performance. Nonproductive late tillers do not improve the performance of primary tillers of wheat plants under drought stress, mainly in high-tillering cultivars. The reduction on the thousand grain weight of only 'Parrudo' detillered plants indicates that assimilate remobilization from late tillers to primary tillers and main stem seems to be more effective in low-tillering cultivars.

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Sistema vascular e controle do desenvolvimento de perfilhos em cereais de estação fria

Cited by 10 publications

References 22 publications

Tiller emission and dry mass accumulation of wheat cultivars under stress

Tiller emission and dry mass accumulation of wheat cultivars under stress

Desenvolvimento reprodutivo de Hyptis suaveolens (L.) Poit.: relação entre fotoperíodo, densidade celular meristemática e padrão de expressão de um ortólogo putativo do gene LEAFY de arabidopsis

Role of nonproductive tillers as transient sinks of assimilates in wheat

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