ISSN:
1573-5060
Keywords:
Zea mays L.
;
maize
;
Sclerophthora rayssiae var
;
zeae
;
brown stripe downy mildew
;
mass selection
;
full-sib selection
;
grain yield
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary The maize (Zea mays L.) cultivar ‘Makki Safed 1’ (MS1) with susceptibility to brown stripe downy mildew (BSDM) caused by Sclerophthora rayssiae var. zeae Payak & Renfro, was subjected to two cycles of mass selection and one cycle of full-sib family selection. Selection was carried out primarily for BSDM resistance. The mass selection was practised under artificial epiphytotic conditions in a disease nursery. Full-sib progenies and performance trials on MS1 and its improved versions were grown in diseased and disease free environments. Mass selection resulted in a significant improvement for resistance to BSDM. A cycle of full-sib selection resulted in an additional improvement for resistance to the disease. The disease rating of the improved version was 1.5 against 4.5 for the original population (scale: 1, highly resistant to 5, highly susceptible). The yield of the improved populations of MS1 was significantly greater than that of MS1 in the disease nursery. In disease free experiments, the improved populations showed almost no yield advantage over MS1. There were also no significant differences between the original population and the improved population after three selection cycles for ear length, ear girth, number of kernel rows per ear, number of kernels per row, 1000-kernel weight, plant height, ear height and days to silk.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00034002
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