INHERITANCE OF LATENT PERIOD LENGTH IN MAIZE INFECTED WITH EXSEROHILUM-TURCICUM
INHERITANCE OF LATENT PERIOD LENGTH IN MAIZE INFECTED WITH EXSEROHILUM-TURCICUM
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DOI：
10.1094/pd-79-0581
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发表时间：
1995-06-01
期刊：
影响因子：
4.5
通讯作者：
CARSON, ML
中科院分区：
文献类型：
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作者：
CARSON, ML
延长潜育期是玉米对玉米大斑病菌引起的北方叶枯病部分抗性的重要组成部分。在田间和温室条件下，潜伏期长度很容易在幼苗上测量，并且已被证明在一定范围的温度和光照条件下是相对稳定的性状。以高抗、潜育期长的供试自交系69-1和中抗、潜育期中等的供试自交系Mo 17与高感自交系A632杂交，在F-2和回交世代研究潜育期长度的遗传。研究在冬季温室条件下和田间进行。两个亲本近交系之间的平均潜伏期差异从14.1天（A632 x 69-1; 1993年田间试验）到1.8天（A632 x Mo 17; 1993年温室试验）不等。对数转换的潜伏期的世代平均值的分析表明，超过92%的世代平均值之间的变化可以解释的加性基因的作用，显性和上位性效应可以忽略不计。遗传力和基因数量的估计与先前发表的估计，以降低成年植物的疾病严重程度衡量的部分抗性，以NLB。在某种后代平均基础上进行选择可能是增加潜伏期的最有效和快速的选择手段，并且可能比选择降低开花后的NLB严重程度更有效。
Extended latent period length is an important component of partial resistance of maize to northern leaf blight (NLB) caused by Exserohilum turcicum. Latent period length is easily measured on seedling plants under both field and greenhouse conditions and has been shown to be a relatively stable trait over a range of temperature and light conditions. The inheritance of latent period length was studied in F-2 and backcross generations of crosses of the experimental inbred line 69-1 (highly resistant, long latent period) and Mo17 (intermediately resistant, intermediate latent period) with the highly susceptible inbred line A632. Studies were conducted under both winter greenhouse conditions and in the field. Differences in mean latent periods between the two parental inbred lines varied from 14.1 days (A632 x 69-1; 1993 field experiment) to 1.8 days (A632 x Mo17; 1993 greenhouse experiment). Analysis of generation means of log-transformed latent periods revealed that over 92% of the variation among generation means could be explained by additive gene action and that dominance and epistatic effects were negligible. Heritability and gene number estimates were in agreement with previously published estimates for partial resistance to NLB measured as reduced disease severity on adult plants. Selection on some sort of progeny mean basis would probably be the most efficient and rapid means of selection for increased latent period and could potentially be more effective than selection for reduced NLB severity after anthesis.