A comparative study of competitiveness between different genotypes of weedy rice (Oryza sativa) and cultivated rice
A comparative study of competitiveness between different genotypes of weedy rice (Oryza sativa) and cultivated rice
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DOI：
10.1002/ps.3534
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发表时间：
2014-01-01
影响因子：
4.1
通讯作者：
Qiang, Sheng
中科院分区：
文献类型：
--
作者：
Dai, Lei;Dai, Weimin;Qiang, Sheng
杂草稻的竞争会对栽培稻造成严重的产量损失。然而，促进竞争力的关键特征仍然没有得到很好的理解。结果（1）南方杂草稻对栽培稻生长和产量的影响在整个生长季中均最大。东北杂草稻在营养生长前期具有很强的竞争力，而东部杂草稻在作物生长后期的竞争力更强。(2)随着杂草稻比例的增加，栽培稻的株高、分蘖数、地上生物量和产量均显著下降，无论杂草稻比例如何，栽培稻始终处于不利地位。(3)杂草生物型具有更大的多样性，估计其香农指数更不利于栽培rice.CONCLUSION的生长和产量的杂草稻生物型的地理起源（纬度），其混合物的比例与作物的竞争和遗传多样性的竞争结果的决定性因素，并在水稻作物产量下降。(c)2013年化学工业协会
BACKGROUNDCompetition from weedy rice can cause serious yield losses to cultivated rice. However, key traits that facilitate competitiveness are still not well understood. To explore the mechanisms behind the strong growth and competitive ability, replacement series experiments were established with six genotypes of weedy rice from different regions and one cultivated rice cultivar.RESULTS(1) Weedy rice from southern China had the greatest impact on growth and yield of cultivated rice throughout the entire growing season. Weedy rice from the northeast was very competitive during the early vegetative stage while the competitive effects of eastern weedy rice were more detrimental at later crop-growth stages. (2) As the proportion of weedy rice increased, plant height, tillers, above-ground biomass, and yield of cultivated rice significantly declined; the crop always being at disadvantage regardless of proportion. (3) Weedy biotypes with greater diversity as estimated by their Shannon indexes were more detrimental to the growth and yield of cultivated rice.CONCLUSIONGeographic origin (latitude) of weedy rice biotype, its mixture proportion under competition with the crop and its genetic diversity are determinant factors of the outcome of competition and the associated decline in the rice crop yield. (c) 2013 Society of Chemical Industry