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Bommisetty Reddyyamini,Chakravartty Navajeet,Hariprasad K. R.,Rameshbabu P.,Sudhakar P.,Bodanapu Reddaiah,Naik Jeevula Bhukya,Reddy B. V. Bhaskar,Lekkala Sivrama Prasad,Gupta Saurabh,Tanti Bhaben,Lach 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.2
The grain number is one of the highly complex and crucial traits determining the grain yield in rice. To identify grain number QTLs in rice, we employed the QTL-seq approach in the 297 F2 population derived from the cross between BPT5204 and NLR33892. In this investigation, five regions viz., qGN1, qGN3, qGN7, qGN9, and qGN12 on chromosomes 1,3,7,9, and 12, respectively, were identified as QTLs governing grain number per panicle in rice. To verify the QTLs identified in the present study, traditional QTL mapping was carried out using InDel markers and previously reported SSRs in the QTL region. From qGN12 QTL, RM6953 showed a significant association with the number of grains per panicle with a phenotypic variance of 24.58, 22.10, and 17.20% in F2, F2:3, and BC1F2 populations, respectively, at < 0.0001 P value, indicating major QTL. From genome resequencing data, a missense variance was observed in the exonic region of LOC_Os12g39330 gene controlling AP2 domain-containing protein which plays an important role in seed development in rice. Hence, this QTL can be a potential target for map-based cloning and marker-assisted transfer to enhance the grain number in rice.
DELAYED HYDRIDE CRACKING IN ZIRCALOY FUEL CLADDING - AN IAEA COORDINATED RESEARCH PROGRAMME
Coleman, C.,Grigoriev, V.,Inozemtsev, V.,Markelov, V.,Roth, M.,Makarevicius, V.,Kim, Y.S.,Ali, Kanwar Liagat,Chakravartty, J.K.,Mizrahi, R.,Lalgudi, R. Korean Nuclear Society 2009 Nuclear Engineering and Technology Vol.41 No.2
The rate of delayed hydride cracking (DHC), V, has been measured in cold-worked and stress-relieved Zircaloy-4 fuel cladding using the Pin-Loading Tension technique. At $250^{\circ}C$ the mean value of V from 69 specimens was $3.3({\pm}0.8)x10^{-8}$ m/s while the temperature dependence up to $275^{\circ}C$ was described by Aexp(-Q/RT), where Q is 48.3 kJ/mol. No cracking or cracking at very low rates was observed at higher temperatures. The fracture surface consisted of flat fracture with no striations. The results are compared with previous results on fuel cladding and pressure tubes.
DELAYED HYDRIDE CRACKING IN ZIRCALOY FUEL CLADDING – AN IAEA COORDINATED RESEARCH PROGRAMME
C. COLEMAN,V. GRIGORIEV,V. INOZEMTSEV,V. MARKELOV,M. ROTH,V. MAKAREVICIUS,Y. S. KIM,KANWAR LIAGAT ALI,J.K. CHAKRAVARTTY,R. MIZRAHI,R. LALGUDI 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.2
The rate of delayed hydride cracking (DHC), V, has been measured in cold-worked and stress-relieved Zircaloy-4 fuel cladding using the Pin-Loading Tension technique. At 250 °C the mean value of V from 69 specimens was 3.3(±0.8)x10⁻⁸ m/s while the temperature dependence up to 275 °C was described by Aexp(-Q/RT), where Q is 48.3 kJ/mol. No cracking or cracking at very low rates was observed at higher temperatures. The fracture surface consisted of flat fracture with no striations. The results are compared with previous results on fuel cladding and pressure tubes.