http://localhost:8080/handle/123456789/2776 2026-04-18T14:15:48Z 2026-04-18T14:15:48Z RAHMAN, MD. MIZANUR http://localhost:8080/handle/123456789/324 2019-10-02T04:51:16Z 2008-12-01T00:00:00Z

STUDY OF FLOWERING PATTERN AND REPRODUCTIVE EFFICIENY IN MUNGBEAN RAHMAN, MD. MIZANUR A pot experiment was conducted at the Iangladesh InsLitute ol Nuclear ALricutture. Mvrnensingh, during September to November 2007 to investigate flower production, tiowering pattern, reproductive eliieienev. yield attributes and their relationship with seed yield in 10 munghean genotypes. The experiment was laid out in a Completely Randomized Design with Ibur replications. High yielding genotypes produced greater number ol opened flowers (range 34.2-45.0 plani1 ) having longer flowering duration (range 15-I8 days) than the low yielding ones. In contrast, low, yielding genotypes produced fewer opened flowers (range 16.1-2] .0 Plant) and also .4   showed shorter flowering duration (range II - IS days) except M13-46 (21 days). I ugh yielding genotypes had higher flower production rate over time than the low yielding ones and maximum flower production occurred within 10-12 days after flowering started. 1-lowever. high yielding genotypes had inferior performance in reproductive eliieicncy (range 52.6-61 .4Q/0) than in low yielding ones (59.5-812%) indicating that there Was a scope of increasing yield by improving the reproductive efficiency in high yielding genotypes in rnungbean. Iligh yielding genotypes maintained increased teal area. TDM. increased flowers and pod numbers plani'. In contrast, low yielding genotypes produced shorter and narrower plant canopy, tower flowers and pods plani'. Seed yield had highly significant and positive correlation with pod number (r = 0.89**) and pod number depended on leaf area (r = 0.75**), TDM (r = 0.84**). raceme (r 0.76*) and flower number (r 0.87*t). Genotypes ML3-l7 and ?v113-35 showed better perlormance in respect of growth, reproductive, yield and yield contributing characters.

2008-12-01T00:00:00Z SHARIFUZZAMAN, MD http://localhost:8080/handle/123456789/323 2019-10-02T04:51:36Z 2008-06-25T00:00:00Z

STUDY ON GROWTH AND DRY MATTER PARTITIONING IN GROUNDNUT GENOTYPES SHARIFUZZAMAN, MD The experiment was carried out at the field laboratory of Bangladesh Institute of Nuclear Agriculture, Mymensingh, to investigate the growth, some morphological features, dry matter production and its partitioning in four groundnut genotypes viz., GM-16, GM-35, GM-45 and Dhaka-1 during the period from December 2007 to May 2008. The experiment was laid out in a randomized complete block design with three replications. Significant variations in morpho-physiological features, yield attributes and dry matter production and its partitioning into different plant parts were found among the four groundnut genotypes. High yielding genotypes had shorter plant height, greater branch number than the low yielder, Dhaka-l. The plant height, leaf area, leaf area index, total dry matter and absolute growth rate (at early growth stage) were superior in Dhaka-1 over its growth period followed by GM-35 but Dhaka-1 produced the lowest pod yield due to unfavorable DM distribution to the economic yield. In contrast, GM-45 performed inferiority in above studied parameters. GM-35 produced the highest pod yield (22.2 g plant" and 3.04 t h&') due to the production of bolder and higher number of pods plant' while Dhaka-1 showed the lowest pod yield although it had the highest number of pods planf' due to production of smaller pods. Total dry matter production and its partitioning into pod (economic yield) were significantly greater in three genotypes than the cultivar, Dhaka-1 with being the highest in GM-35.

2008-06-25T00:00:00Z NAHAR, KAMRUN http://localhost:8080/handle/123456789/322 2019-10-02T04:51:52Z 2008-06-01T00:00:00Z

SCREENING OF RICE GENOTYPES AGAJNST LOW TEMPERATLIRE STRESS NAHAR, KAMRUN The research work was conducted at the Bangladesh Rice Research Institute. Gazipur from October 2007 to May 2008 with 244 rice breeding lines obtained from different sources. The seeds were sown on IS October 2007 so that the genotypes would have the experience of low temperature stress at their vegetative as well as reproductive phases. Cluster and Discriminant Function Analysis was perlornied to screen out genotypes having better performance with respect to phenotype as well as yield perk)nnance. Accordingly, genotypes 177496-31-2-1-3. 1R77504-36-3-3- I. BR7528-2R-20-1. 11173689-19-I. 1R62266-42-6-2 and PSBRC68 were selected from cluster I. Genotype 8(1358-I was selected from cluster 3. Another genotype RC1358-3 was selected from the cluster 4 lbr desirable attributes. Geuol\ pes having yield level more than 400 g ni' were selected primarily as low temperature tolerant. There were short and long duration genotypes in those groups. Spikcict ni'2 played the most important role in grouping the genotypes. The combination of yield components was quite better in Group I. The genotypes having the highest spikelet number with better yield was iotLnd in Group Ill and IV but they had lower thousand-grain weight. The maximum and mimmttm temperature around panicle initiation (Pt) were 28.7 "C and 10.9°C for short duration genotypes and 24.4 and 11.0°C (hr long duration genotypes. Solar radiations during those periods were 235.2 and 191.5 Cal cm'2. tue critical low temperatures for agronomie P1 (24 (lays to flowering) and reduction division are 18 and I 9SC. respectively. In reality, the occurrence of low temperature was fur below than those of the critical marks. The genotypes encountered low temperature and low solar radiation from vegetative to reproductive phases. A few genotypes li&e 11(77496-3 l-2-t-3-1 (Group 1) and 1R77496-31-2-1-3-2 (Group 11) maintained better phenotvpic acceptability. Most of the selected genotypes experienced spikelet -  degeneration symptom. The genotypes (Group 1. III and IV) producing huge number of spikelets might able to execute panicle differentiation at the initiation of panicle development. But at the subsequent stage there must have some growth impairment activities. In contrast, the genotypes (Group II and V) which having lower number ol spikelet rn'2 might be aifeeted primarily at the diliërentiation stage then at the reduction division stage. The varieties which were able to maintain their good phenotype were tolerant to low temperature stress. Sonic of the genotypes having an exciting level of yield indicated their all-round tolerance to the cold. It may be concluded that some of the genotypes could be selected as high yielding and better performing genotypes from group I. Ill and IV. The genotypes selected from this study have significant tolerance to critical low temperature. 'I he genotypes having short growth duration might have the tolerance to withstand low minimum temperature and those with long growth duration are appeared to have stress avoidance mechanism. As 1)2 between the cluster 2 and cluster 3 was the hiuhest. A  breeders could have the better chance of heterosis crossing between these two groups. CONTENTS Chapter T

2008-06-01T00:00:00Z