Impact of Selection on Distribution of Crop Duration Parameters in Chinese Wheat Hybrids
Impact of Selection on Distribution of Crop Duration Parameters in Chinese Wheat Hybrids
Zainab Iftikhar, Muhammad Arif, Iqbal Munir and Sajid Ali
ABSTRACT
Changes in climatic conditions would strongly influence the crop duration of many crops including wheat, which necessitates exploration of diversity in crop duration parameters in wheat with particular emphasis on novel sources of genetic variation, including hybrid wheat. The present work was designed to assess the potential of Chinese wheat hybrid germplasm for cultivation across Pakistan. For this purpose, 416 hybrids were assessed for diversity in crop duration parameters in the year 2017-18 and a subset of better performing 108 hybrids were selected and assessed for subsequent assessment. During the first experiment of preliminary testing of 416 Chinese wheat hybrids along with 5 local checks tested during 2017-18, significant variability (P<0.01) was observed for days to jointing and booting, the parameters related to crop duration. The overall impact was negative on the crop duration, resulting in selection of earlier lines. Although selection increased the mean value, the variability decreased for most of the parameters. Variability in Chinese hybrids reflects on the potential of selection for candidate hybrids to be released in Pakistan after proper testing. The variability could also be exploited for generation of further variability in Pakistani wheat germplasm for normal varietal development as a novel source of germplasm to reduce genetic homogeneity.
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