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Articles by H. Wunna
Total Records ( 2 ) for H. Wunna
  H. Wunna , S. Jogloy , B. Toomsan and J. Sanitchon
  This study was aimed to examine the response and contribution of early drought to traits related to N2-fixation and pod yield and their correlation to drought tolerance. The experiment was conducted at the Field Crop Research Station of Khon Kaen University, Khon Kaen Province, Thailand in the dry season of 2007/08. Eleven peanut genotypes (ICGV 98300, ICGV 98303, ICGV 98305, ICGV 98308, ICGV 98324, KK 60-3, Tainan 9, KKU 72-1, KKU 60, KK 4 and KKU 1) and two soil moisture levels [field capacity (FC) and 1/3 available water (1/3 AW)] were laid out in a split-plot design with four replications. Early drought treatment was given by maintaining 1/3 AW from emergence to 40 days after emergence followed by adequate water supply. The data were recorded for nodule dry weight (NDW) and biomass production (BM) as traits related to N2-fixation (TNf) at harvest. In addition to, the data on pod yield, number of pod plant-1, number of seed pod-1 and seed size (SZ) were also collected at harvest. Specific leaf area (SLA) and SPAD chlorophyll meter reading (SCMR) were measured on 20, 40, 50 and 60 days after emergence (DAE) as drought tolerance traits and harvest index (HI) was calculated after harvest. Early drought did not affect NDW and BM. Major variation was found among peanut genotypes and ICGV 98305 showed higher NDW and pod yield under drought condition. Significant and consistent correlation was found between NDW and BM, (r = 0.82*, p < 0.05) and (r = 80*, p < 0.05) under FC and 1/3 AW, respectively. The correlation between TNf and pod yield and yield component parameters varied under the two water regimes. Under 1/3 AW, the only positive correlation observed was between SZ and BM and it might be the only reason for increase in pod yield in some genotypes. SCMR at 60 DAE was strongly related with TNf under both water regimes. There was not any correlation between SLA and HI with NDW and BM. SCMR at 60 DAE is useful to detect chlorophyll density and N2-fixation under both water regimes because of its high and constant correlation with TNf.
  H. Wunna , S. Jogloy , B. Toomsan , J. Sanitchon and A. Patanothai
  The improvement of peanut for drought tolerance and high N2-fixation is the best way to enhance peanut production under drought condition. Besides, the heritability estimates of traits related N2-fixation and its genetic correlation with yield and drought tolerant traits are useful to formulate the effective breeding program under drought. Therefore, the aims of this study were to estimate the heritabilities (h2) and genotypic correlation (rG) among traits related to N2-fixation (TNf), yield and drought tolerant traits under early drought and non stressed condition. Ninety lines in the F4:8 generations from four peanut crosses were tested under Field Capacity (FC) and one-third Available Water (1/3 AW). Data were recorded for Nodules Dry Weight (NDW), Biomass Production (BM), Pods Yield (PY), number of pod plant-1, number of seed pod-1 and 100 seed weight at harvest. Specific Leaf Area (SLA), SPAD Chlorophyll Meter Reading (SCMR), Harvest Index (HI) and Drought Tolerance Index (DTI) of PY and BM were measured and calculated as drought tolerant traits. The h2 for BM, PY, number of pod plant-1 and 100 seed weight were high for all tested crosses under both water regimes. With exception of HI trait, high h2 estimates, also, were found for drought tolerant traits under both water regimes. The genotypic correlation (rG) between NDW and BM was positive highly significant under both 1/3 AW and FC. BM and PY showed high rG, whereas, BM and 100 seed weight showed moderate rG. Moderate rG was found between BM and SCMR 60 DAE under 1/3 AW and FC. Significant correlations between FC and early drought were found for BM indicating that selection of this trait could be done under both water regimes. BM is possible to select and breed for high N2-fixation, PY and possibly, drought tolerance because of high h2 and significant rG with PY and SCMR 60DAE.
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