Morphological and molecular characterization of some NERICA mutant lines under drought condition

Abstract

To ensure the productivity of rice in drought condition, ‘NERICA’ varieties of African origin has been introduced in Bangladesh and subsequently mutant lines are also developed for improving the performance further. The present study was undertaken to screen out better drought tolerant mutant lines of NERICA having other desirable traits. Thirteen NARICA mutant lines, four susceptible (BINA dhan8, BINA dhan10, BINA dhan11 and BINA dhan12) and one tolerant (BRRI dhan56) varieties were included in the experiment and selection was based on morphological and molecular characteristics. The plants were grown in pot containing 9 kg of soil and when they were 60 days old, drought was imposed by adding 1L of distilled water at every four days interval till harvesting. The quantity of water applied to control pots was double. The results showed that important yield contributing morphological attributes like days of 50% flowering, plant height, total number of tiller hill-1, panicle length, 100 seed weight, fresh weight of plant and dry weight of plant were significantly positively regulated due to drought in N10/300/P-2(1)-3-5, N1/250/P-6-2-7 and N10/300/P-2(1)-6-13 mutant lines. The findings of genetic diversity analysis through SSR markers RM32, RM202, RM351 and RM510 for N10/300/P-2(1)-3-5, N1/350/P-2-2-6 and N1/250/P-6-2-7 lines appeared to resemble to that of control (BRRI dhan56) from the UPGMA dendrogram. Based on morphological, molecular characteristics and UPGMA dendrogram study, mutant lines N10/300/P-2(1)-3-5 and N1/250/P-6-2-7 lines appeared superior as genetic material for developing better drought tolerant rice varieties.Progressive Agriculture 26:15-21, 2015

Genetic Divergence and Heritability Study of Some NERICA Mutant Lines and Their Parents Using Microsatellites Marker and Morphological Traits in Rice

“…According to Nei, [45] the highest level of gene diversity (0.871) was observed in loci RM202 and the lowest level of gene diversity (0.748) was observed in loci RM32 with a mean diversity of 0.821 (Table-7). Similar high level of mean gene diversity (0.8580) was also reported by Hasan et al [6]. The polymorphism information content (PIC) value provides an estimate of discriminating power of a marker based on the number of alleles at a locus and relative frequencies of these alleles.…”

“…In Bangladesh, NERICA is not a released variety it is in trial condition and due to its draught tolerance, high yielding and early maturity it has great importance in our country to increase food security. But due to soil variation and climatic change the field record of NERICA was not very promising [6]. In order to improve NERICA varieties for Bangladesh different variation in yield contributing characters such as, tiller number, panicle length, plant height, days to maturity, filled grain per panicle, yieldper plant etc.…”

Evaluation of Iraqi Rice Cultivars for Their Tolerance to Drought Stress

“…Nerica7 (New Rice for Africa) was released in the year 2000 and developed by crossing O. sativa and O. glaberrima (often called African rice). It is one of the eighty-two different upland and lowland African rice varieties adapted for rain-fed or irrigated environments [71].…”