HERITABILITY OF RESISTANCE AND REPEATABILITY OF CLONE REACTIONS TO SUGARCANE SMUT IN LOUISIANA
HERITABILITY OF RESISTANCE AND REPEATABILITY OF CLONE REACTIONS TO SUGARCANE SMUT IN LOUISIANA
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DOI：
10.1094/phyto-80-622
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发表时间：
1990-07-01
期刊：
影响因子：
3.2
通讯作者：
MARTIN, FA
中科院分区：
文献类型：
--
作者：
CHAO, CP;HOY, JW;MARTIN, FA
通过比较18个抗病、中感和高感无性系的双亲杂交亲本和后代对甘蔗黑穗病的侵染率，估计了甘蔗黑穗病抗性的遗传力。抗性后代在抗性时期出现的频率最高。抗性杂交。单株甘蔗(第一季作物)和第一宿根甘蔗(第二季作物)的狭义遗传力估计值为0.41。0.08和0.38。+-。分别为0.11和0.11。根据假设的选择强度，抗性的估计遗传增益在5%到13%之间。两种宿根甘蔗亲本黑穗病反应的重复性估计为0.60。0.10和0.75。+-。分别为0.07和0.07。从植株甘蔗到第一次宿根后代的重复性估计为0.62.+-。0.08。黑穗病接种试验中供试品种对黑穗病的反应在新植甘蔗与一次宿根、后植甘蔗或一次宿根作物之间也表现出中等的重复性。在植株甘蔗和第一次再生植株之间的两个群体中，对植物甘蔗黑穗病抗性、中感和高度感病无性系的重复力估计为中等抗病和高度感病无性系，而对中感无性系的重复力估计较低。无性系的黑穗病抗性等级在不同作物间和不同年份间显著相关。结果表明，通过尽量减少感病亲本的使用，可以提高抗病后代的比例；为了准确地评价甘蔗无性系黑穗病的敏感性，需要进行多次接种试验的植株侵染分级。
Heritability of resistance to sugarcane smut caused by Ustilago scitaminea was estimated by comparing percentages of shoot smut infection of parents and offspring from 18 biparental crosses involving resistant, moderately susceptible, and highly susceptible clones. Frequencies of resistant offspring were highest in resistant .times. resistant crosses. Narrow-sense heritability estimates, determined by mid-parent-offspring regressions in plant cane (first-season crop) and first ratoon (second-season crop) were 0.41 .+-. 0.08 and 0.38 .+-. 0.11, respectively. Estimated genetic gains in resistance ranged from 5 to 13% depending upon the assumed selection intensity. Estimates of repeatability of smut reactions of parents in two plant cane crops and from plant cane to first ratoon were 0.60 .+-. 0.10 and 0.75 .+-. 0.07, respectively. The repeatability estimate for offspring from plant cane to first ratoon was 0.62 .+-. 0.08. Disease reactions of experimental cultivars in breeding program smut inoculation tests also were moderately repeatable between plant cane and first ratoon and subsequent plant cane or first ratoon crops. Repeatability estimates for clones rated as resistant, moderately susceptible, or highly susceptible to smut in plant cane were moderate for resistant and highly susceptible clones and low for moderately susceptible clones in two populations between plant cane and first ratoon. Smut resistance ratings assigned to clones were significantly correlated between crops and in different years. The results suggest that the proportion of resistant progeny can be increased by minimizing the use of susceptible parents and that plant cane infection ratings from multiple inoculation tests are needed to accurately assess sugarcane clone smut susceptibility.