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Causes for silk delay in a lowland tropical maize population

By: Edmeades, G.O.
Contributor(s): Bello, S [coaut.] | Bolaños, J.A [coaut.] | Hernandez, C.M [coaut.].
Material type: materialTypeLabelArticlePublisher: 1993ISSN: 1435-0653 (Revista en electrónico).Subject(s): Drought resistance | Flowering | Lowland | Resistance to injurious factors | Spikelets | Tropical zones | Zea mays AGROVOC In: Crop Science v. 33, no. 5, p. 1029-1035649238Summary: A shortened anthesis-to-silking interval (ASI) in maize is associated with tolerance of stresses which occur around flowering time. It is not known if this reflects differences in tassel and ear initiation dates, or in rates of development and growth. These characteristics were studied in selection cycles 0, 2, 4, 6 and 8 of the lowland tropical maize population Tuxpeno Sequia which was selected recurrently for drought tolerance and whose selection cycles differ for ASI. Plants were grown at Tlaltizapan, Mexico, at high plant density and under mild and severe drought stresses that occurred during flowering. Silking was delayed significantly, especially in C0 and C2 plants under severe drought. Stress treatments did not affect days to 50% tassel initiation, ear initiation, or anthesis. The interval between 50% tassel and ear initiation, the rate of spikelet initiation, and crop growth rate near flowering were unaffected by selection. Per cycle changes were -0.21 d in duration of ear spikelet initiation and -16.9 for spikelet number per ear at 50% anthesis. Selection changed relative growth rates at 50% anthesis by 0.005 d-1 per cycle for ears, by 0.007 d-1 per cycle for spikelets and by -0.009 d-1 per cycle for tassels. These changes were unaffected by stress level. Eight cycles of selection increased the mean ear and spikelet weights at 50% anthesis by 127 and 173%, respectively. The ASI increased rapidly when mean spikelet biomass at 50% anthesis was less than 0.8 mg. Results indicate that a decreased ASI arising from selection in this population is due largely to an increased rate of biomass accumulation per spikelet, and development of fewer spikelets per earCollection: CIMMYT Staff Publications Collection
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Item type Current location Collection Call number Copy number Status Date due Barcode Item holds
Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-2650 (Browse shelf) 1 Available 649238
Total holds: 0

Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0011-183X

A shortened anthesis-to-silking interval (ASI) in maize is associated with tolerance of stresses which occur around flowering time. It is not known if this reflects differences in tassel and ear initiation dates, or in rates of development and growth. These characteristics were studied in selection cycles 0, 2, 4, 6 and 8 of the lowland tropical maize population Tuxpeno Sequia which was selected recurrently for drought tolerance and whose selection cycles differ for ASI. Plants were grown at Tlaltizapan, Mexico, at high plant density and under mild and severe drought stresses that occurred during flowering. Silking was delayed significantly, especially in C0 and C2 plants under severe drought. Stress treatments did not affect days to 50% tassel initiation, ear initiation, or anthesis. The interval between 50% tassel and ear initiation, the rate of spikelet initiation, and crop growth rate near flowering were unaffected by selection. Per cycle changes were -0.21 d in duration of ear spikelet initiation and -16.9 for spikelet number per ear at 50% anthesis. Selection changed relative growth rates at 50% anthesis by 0.005 d-1 per cycle for ears, by 0.007 d-1 per cycle for spikelets and by -0.009 d-1 per cycle for tassels. These changes were unaffected by stress level. Eight cycles of selection increased the mean ear and spikelet weights at 50% anthesis by 127 and 173%, respectively. The ASI increased rapidly when mean spikelet biomass at 50% anthesis was less than 0.8 mg. Results indicate that a decreased ASI arising from selection in this population is due largely to an increased rate of biomass accumulation per spikelet, and development of fewer spikelets per ear

English

R93ANALY|Crop Science Society of America (CSSA)|MP|3

CIMMYT Staff Publications Collection

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