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Relaciones entre el crecimiento y el desarrollo para la determinación del rendimiento de trigo

By: Contributor(s): Material type: TextPublication details: La Estanzuela (Uruguay) INIA|CIMMYT : 1998ISBN:
  • 9974-7586-0-2
Subject(s): DDC classification:
  • 633.1158 KOH
Summary: The crop conditions in the early stages of development are critical to establish the yield potential. The lack of synchrony between the main tiller and other tillers makes the survival of the latter difficult. Also, the weak plants have few spikelets. Both of these factors contribute to produce a small number of grains per unit area. This was found true in various experiments conducted on commercial genotypes grown in Rio Grande do Sul, Brazil, at approximately 30º South (latitude).||The data presented here represents average of many varieties and can change according to the crop conditions. The development of the main tiller depends on the temperature and the potential number of leaves that varies between 10 to 12 for the Brazilian varieties. The phylochrome varies around 100º C (average) indicating the need of 1200º C till flowering. The leaf development (rate of emission and the number of leaves) is a relatively constant process with small environmental effects. The spike differentiation on the main tiller becomes visible during emission of the 6th till the 7th leaf. At this stage, the plants are more vigorous and differentiate a large number of spikelets. The spikes of other tillers become visible more or less at the stage of spike differentiation of the main tiller. At this moment, there are 3 to 4 leaves on the first tiller and 2 to 3 leaves on the second. The lack of synchrony between the main tiller and other tillers delays the differentiation and reduces the survival of the tillers.||The number of grains is associated with the potential number or spikelets developed till the flowering. In general, there are 10 000 to 12 000 grains/m2 observed in a majority of the varieties. A small number of grains are attributed to a small number of spikes due to reduced survival of the tillers or individual plants in a community. The unfavorable crop conditions during the tillering stage also reduce the number of potential spikelets. The grains take between 30 and 35 days to fill with 30 mg of average weight (which varies according to the environment and genotype). Plant dry weight in a community is more or less constant between flowering and maturity. This indicates the importance to achieve high plant dry matter in a community at the flowering time and the possible importance of the reserves in the formation of grains.
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Item type Current library Collection Call number Copy number Status Barcode
Book CIMMYT Knowledge Center: John Woolston Library CIMMYT Publications Collection 633.1158 KOH (Browse shelf(Opens below)) 1 Available J628207
Book CIMMYT Knowledge Center: John Woolston Library CIMMYT Publications Collection 633.1158 KOH (Browse shelf(Opens below)) 2 Available J633514
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The crop conditions in the early stages of development are critical to establish the yield potential. The lack of synchrony between the main tiller and other tillers makes the survival of the latter difficult. Also, the weak plants have few spikelets. Both of these factors contribute to produce a small number of grains per unit area. This was found true in various experiments conducted on commercial genotypes grown in Rio Grande do Sul, Brazil, at approximately 30º South (latitude).||The data presented here represents average of many varieties and can change according to the crop conditions. The development of the main tiller depends on the temperature and the potential number of leaves that varies between 10 to 12 for the Brazilian varieties. The phylochrome varies around 100º C (average) indicating the need of 1200º C till flowering. The leaf development (rate of emission and the number of leaves) is a relatively constant process with small environmental effects. The spike differentiation on the main tiller becomes visible during emission of the 6th till the 7th leaf. At this stage, the plants are more vigorous and differentiate a large number of spikelets. The spikes of other tillers become visible more or less at the stage of spike differentiation of the main tiller. At this moment, there are 3 to 4 leaves on the first tiller and 2 to 3 leaves on the second. The lack of synchrony between the main tiller and other tillers delays the differentiation and reduces the survival of the tillers.||The number of grains is associated with the potential number or spikelets developed till the flowering. In general, there are 10 000 to 12 000 grains/m2 observed in a majority of the varieties. A small number of grains are attributed to a small number of spikes due to reduced survival of the tillers or individual plants in a community. The unfavorable crop conditions during the tillering stage also reduce the number of potential spikelets. The grains take between 30 and 35 days to fill with 30 mg of average weight (which varies according to the environment and genotype). Plant dry weight in a community is more or less constant between flowering and maturity. This indicates the importance to achieve high plant dry matter in a community at the flowering time and the possible importance of the reserves in the formation of grains.

Spanish

0105|AL-Wheat Program|AGRIS 0102

Jose Juan Caballero

CIMMYT Publications Collection

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