GENETIC ANALYSIS OF GRAIN YIELD AND OTHER AGRONOMIC TRAITS OF MAIZE (Zea mays L.) UNDER WATER STRESS AND NON-WATER STRESS CONDITION

By

Author

Presented To

Department of Agricultural Science

ABSTRACT
The study was set out to estimate heterosis, combining ability, heritability, gene action and correlation of grain yield and other agronomic traits under water stress and non-water stress conditions. Seven maize varieties were crossed to six inbred lines resulting in 42 top cross hybrids. The 13 parents, 42 hybrids and a check were evaluated for drought tolerance under water stress and non-water stress conditions at the Institute for Agricultural Research Station farms at Samaru and Kadawa during 2012/2013 dry season. Data were collected for number of days to 50% tasseling (DT), number of days to 50% silking (DS), anthesis-silking interval (ASI), plant height (PHT), ear height (EHT), leaf senescence (SEN), number of ears per plant (NEP) and grain yield (GY). Among the top cross hybrids, Sammaz 34 x P2 recorded the highest GY (2030.99kg/ha) which was 44.6% higher than the check under non-water stress condition and 143% increase relative to the check under severe-water stress condition. Sammaz 34 x P2 and Sammaz 36 x P2 recorded highest GY estimates under severe-water stress condition across locations (2031kg/ha and 1495kg/ha, respectively). All the traits recorded higher values of phenotypic coefficient of variation than genotypic coefficient of variation under the three different water stress conditions in both locations and across locations. This indicates presence of high variability for these traits and provides ample scope for selection of superior genotypes. Broad sense heritability estimates generally ranged from moderate to high in both locations and across locations under the three different water stress conditions indicating considerable potential for development of drought tolerant and high yielding varieties. The ratios of general combining ability to specific combining ability variances across locations were less than unity for all the traits under the three conditions indicating importance of non-additive gene action in controlling these traits. The results revealed that Sammaz 17 was a good general combiner among vii the seven female parents while P3 was a good general combiner for GY among the male parents under water stress condition across locations. The top cross hybrid Flint Q x P8 which involved parents with high x low general combining ability effects was promising as it had highly significant positive heterosis for GY (181.48%) under severe-water stress condition and also exhibited positive specific combining ability status for GY (134.92) under severe-water stress conditions across locations. Correlations with grain yield showed that DT, DS and ASI were negatively correlated with GY while PHT, EHT and NEP were positively correlated with GY under the three water stress conditions. This indicates that corresponding increase in GY can be achieved through selection of the positively correlated traits under both non-water stress and stress conditions across locations. Molecular approaches which offer exciting ways of shortening the time for variety development is recommended along with the conventional breeding strategies to develop drought tolerant hybrids.


PLEASE NOTE:

That this Material is a Complete Project, Well Written and Contains 1 to 5 Chapters.


Click the download Button Below to Download the complete work. OR Call/WhatsApp Admin on: 09019904113 for Inquiry. Thank You

About E-Project Material Centre


E-Project Material Centre is a web service aimed at successfully assisting final year students with quality, well researched, reliable and ready made project work. Our materials are recent, complete (chapter 1 to Minimum of Chapter 5, with references) and well written.INSTANT ACCESS! INSTANT DOWNLOAD. Simply select your department, choose from our list of topics available and explore your data

Why Students Love to Use E-Project Material ?


Guaranteed Delivery Getting your project delivered on time is essential. You cannot afford to turn in your project past the deadline. That is why you must get your project online from a company that guarantees to meet your deadline. e-Project Topics Material Centre is happy to offer instant delivery of projects listed on our website. We can handle just about any deadline you send our way. Satisfaction Guaranteed We always do whatever is necessary to ensure every customer's satisfaction

Disclaimer


E-Project Topics Material Centre will only provide projects as a reference for your research. The projects ordered and produced should be used as a guide or framework for your own project. The contents of the projects should be able to help you in generating new ideas and thoughts for your own project. It is the aim of e-Project Topics Centre to only provide guidance by which the projects should be pursued. We are neither encouraging any form of plagiarism nor are we advocating the use of the projects produced herein for cheating.

Terms and Condition


Using our service is LEGAL and IS NOT prohibited by any university/college policies You are allowed to use the original model papers you will receive in the following ways:
  • As a source for additional understanding of the subject
  • As a source for ideas for you own research (if properly referenced)
  • For PROPER paraphrasing ( see your university definition of plagiarism and acceptable paraphrase) Direct citing ( if referenced properly)
Thank you so much for your respect to the authors copyright
X

Need Help Finding or Downloading Your Project Material?

If you don't see the topic you're looking for or You need urgent/express attention, click the WhatsApp Icon/link below to contact ADMIN and get the material you need instantly. We are always available online to attend to your needs. Thanks