Evaluation of Advance Bread Wheat Lines in Preliminary Wheat Yield Trial

Development of superior crop varieties is the prime objectives of all plant breeding programs. Fourteen bread wheat lines selected from 20 Semi Arid Wheat Yield Trials received from CIMMYT-Mexico. th The experiment was planted in randomized complete block design with three replications at Barani Agricultural Research Station, Kohat during 2013-14. Data were recorded on days to heading, days to maturity, plant height, tillers m and grain yield. Analysis of variance revealed highly significant differences among genotypes for 2 all the traits studied. Seven entries viz. E-304, E-311, E-314, E-325, E-360, E-384 and E-388 out yielded check cultivar KT-2010 and will forwarded for multi-location testing to be released as new variety for rainfed areas.


INTRODUCTION MATERIALS AND METHODS
Wheat is the major food grain crop of the world and This study was conducted in Barani Agricultural is the staple food of millions people around the globe.
Research Station (BARS) Kohat, during 2013-2014 Wheat is widely adaptable to wide range of climatic cropping season.The material comprised of 14 elite wheat conditions.About 70% of the world wheat is cultivated lines selected from fifty entries received as 20 SAWYT under rainfed conditions [1].Generally, wheat crop is from CIMMYT Mexico and were screened during 2012-13 affected from both heat and drought which usually cropping season.Thirteen promising lines were selected occur simultaneously to cause significant reduction in on the basis of high yield potential and disease yield [2].In Pakistan, wheat is grown cultivated under resistances.These lines were included in preliminary rainfed condition is more than 20% of the total wheat yield trial 2013-14 for testing against local check wheat area mainly in Khyber Pakhtunkhwa.Due to this, cultivar KT-2010.Randomized Complete Block Design the average farmer yield in Khyber Pakhtunkhwa is about with 3 replications was used.Each entry consisted of six 1500 kg ha , which is about half of the national yield.
rows with row length of 5 meters and row to row distance 1 Low yield under rainfed conditions is generally due to low of 0.3 m.Standard agronomic practices was carried out soil moisture at sowing and heat stress at reproductive throughout the growing season.Normal dose of fertilizers stage.
i.e.N: P O @ 80:58 kg/ha were applied at the time of Development of resistant variety better suited to sowing.Data were recorded on days to heading, days to rainfed/stress condition is the prime objective of many maturity, plant height (cm), tillers m and grain yield wheat breeding program across the globe.However, (kg/ha).List of entries included in the trials are given in the success achieved so far is not up to the mark and Table 1.need due consideration in current and future breeding schemes.
Statistical Analysis: The data collected were subjected to Therefore, the present study was undertaken analysis of variance technique appropriate for randomized to select early maturing, high yielding and complete block design using computer software Statix ver disease resistant wheat line for rainfed areas of 8.1.Upon significant differences means were separated Khyber Pakhtunkhwa.
using LSD test at 5% level of probability.
th Days to Maturity: Mean values for days to maturity of 14 maximum days to heading, which is statistically at par with wheat lines are presented in Table 2. Days to maturity entry E-311(125 days) and entry E-313(124 days).
ranges from 158 to 165 with the mean value of 163 days.

Table 1 :
List of entries with their parentage included in the trials

Days to Heading:Mean values
of 14 wheat lines for days findings are in line with the earlier research work of to heading are presented in Table 2. Days to heading of Wardlaw [3].fourteen wheat lines ranged from 121 to 126 with the mean value of 123 days.Entry E-314 and E-310 (126 days) took

Table 2 :
Mean squares for various morpho-physiological and yield traits of 14 bread wheat lines evaluated at BARS, Kohat during 2013-14 CV= Coefficient of variation and df= degree of freedom **, * = significant at 1% and 5 % level of probability, respectively Table 3: Mean performance of 14 bread wheat lines evaluated under Preliminary wheat yield trial (PWYT) at BARS, Kohat during 2013-14 Entry Days to heading (days) Days to maturity (days) Plant height (cm) Tillers m Grain yield (kg ha )