Study of genetic variation in safflower genotypes (Carthamus tinctorius L.) in terms of some morphological and agronomic traits

Subject Areas :

Ali Khomari ¹ (PhD student of karaj islamic azad university)
Saeed Omrani ² (Department of Plant Breeding, Shahed University, Tehran, Iran)
Ali Omrani ³ (دانشجوی دوره دکتری اصلاح نباتات، گروه به‌نژادی و بیوتکنولوژی گیاهی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران)
Khodadad Mostafavi ⁴ (Associated Professor, Department of Agronomy and Plant Breeding, Karaj Branch, Islamic Azad University, Karaj, Iran.)

Received: 2017-12-01 Accepted : 2018-01-30 Published : 2017-11-22

Keywords: Safflower, stepwise regression analysis, Correlation coefficients, causality analysis,

Abstract :

In this study, 32 safflower genotypes in a randomized complete block design with three replications at the Research Farm of Islamic Azad University, Karaj Branch. Plant yield, 1000-seed weight, number of branches, number of bolls per plant, boll weight, flowering time, seedling time, plant height and flowering time were measured and recorded. Results and Discussion: The results of variance analysis confirmed the diversity of all studied traits among all genotypes studied. The simple correlation coefficients among the traits showed that the weight of the boll and the number of bolls per plant had a positive and significant correlation with plant yield with correlation coefficients of 0.85 and 0.61 respectively at 1% probability level. Based on the results of stepwise regression analysis, the weight of the boll weight and the number of bolls per plant were 75.60% of the variation in plant yield. The results of causal analysis indicated that the most direct and positive effects were related to the weight of the boll weight (1.104). The number of boll/bush had the most indirect effect (0.916) on plant yield through boll weights.