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Articles by P. Songsri
Total Records ( 6 ) for P. Songsri
  P. Songsri , S. Jogloy , T. Kesmala , N. Vorasoot , C. Akkasaeng , A. Patanothai and C.C. Holbrook
  The aims of this study were to evaluate genetic variations in yield and reproductive developmental characters among peanut genotypes in response to drought and relate these responses to pod yield under different soil moisture. Eleven peanut genotypes were tested under three soil moisture levels [field capacity (FC), 2/3 available soil water (AW) and 1/3AW] in field experiments. Data were recorded for number of flowers, pegs (RSs), immature pods and mature pods per plant, seed per pod, 100-seed weight and pod yield at harvest. A drought tolerance index (DTI) for pod yield was calculated as the ratio of pod yield under stress treatment to that under well-watered conditions. The differences among water regimes were significant for pod yield, number of RSs, immature pods and mature pods per plant, seed per pod and 100 seed weight and differences among genotypes were significant for all traits. Drought reduced pod yield, number of RSs, pods and mature pods per plant. Early peak of flowering is important for the formation of mature pods under drought conditions. Two different strategies were used in maintaining high pod yield under drought. High yield potential was important for ICGV 98348 and ICGV 98353, whereas low pod yield reduction was important for ICGV 98305, ICGV 98303 and ICGV 98300. Tifton 8 showed the lowest pod yield and poor seed filling. High RSs and well-filled mature pods were the most important traits contributing to high pod yield in drought resistant genotypes.
  P. Songsri , N. Vorasoot , S. Jogloy , T. Kesmala , C. Akkasaeng , A. Patanothai and C.C. Holbrook
  The aim of this study was to evaluate the responses to difference in available soil water levels for yield and reproductive characters of peanut genotypes and relate these responses to pod yield under drought conditions. Eleven peanut genotypes were tested under three soil moisture levels (Field Capacity (FC), 2/3 available soil water (AW) and 1/3AW). Data were recorded for total number of flowers, pegs (reproductive sinks; RSs), immature pods and mature pods per plant, number of seeds per pod, 100-seed weight and pod yield at harvest. Drought at mild and severe levels significantly reduced Harvest Index (HI), yield components and reproductive developmental characters and the reductions were most substantial for pod yield with increasing moisture stress. High pod yield under drought conditions in ICGV 98300 was caused by high potential yield and low yield reduction, whereas high pod yield in ICGV 98324 was due to low pod yield reduction. High HI and numbers of mature pods are advantageous and necessary for high yield under drought conditions. High conversion of RSs to total pods and conversion of flowers to mature pods were the most important factors contributing to high pod yield under mild drought (2/3 AW) and severe drought (1/3 AW), respectively. Tifton 8 showed the lowest pod yield and poor seed filling under well-watered and droughts conditions.
  S. Boontang , P. Songsri , S. Jogloy , C. Akkasaeng , N. Vorasoot , N. Tantisuwichwong and A. Patanothai
  Objective of this study was to investigate whether physiological traits related to drought tolerance can correctly identify the peanut genotypes with high yield under water-limited conditions. Seven released cultivars and two drought tolerant lines were arranged in a split plot design with four replications for two years. The two water regimes (field capacity; FC and 2/3 available water; 2/3 AW.) were assigned in main plots and peanut genotypes were assigned in subplots. The data were recorded for SPAD Chlorophyll Meter Reading (SCMR), Specific Leaf Weight (SLW), biomass, pod yield, harvest index (HI), number of mature pods, shelling percentage, 100-seed weight and number of seeds per pod. SLW and SCMR could effectively identify peanut cultivars with higher pod yield under water-limited conditions. KK 60-3, KKU 72-1 and KKU 60 were identified as drought tolerant because they had SCMR and SLW, which were similar to those of ICGV 98324 and ICGV 98308. KK 60-3 had high biomass under water limited conditions because of high potential but it had poor pod yield, whereas KKU 60 had the highest pod yield and HI. KKU 60 also had the highest pod yield under well-watered conditions. The results indicated that some released cultivars had degree of drought tolerance similar to or better than that of the drought tolerant lines. The improvement of peanut cultivars for drought tolerance can be site-specific.
  N. Jangpromma , P. Songsri , S. Thammasirirak and P. Jaisil
  In vitro assessments of chlorophyll content are expensive, laborious and time consuming. The alternative methods which are more rapid and straightforward could be very useful. The aim of this study was to investigate the effects of water stress on chlorophyll content and SPAD Chlorophyll Meter Reading (SCMR) and the relationship between chlorophyll content and SCMR under well-watered and drought conditions. Ten sugarcane genotypes (Uthong 6, Khon Kaen 80, K86-161, Khon Kaen 3, 03-4-425, KU60-1, Phill.66-07, B34-164, Uthong 2 and LF82-2122) and two water regimes (well-watered control and water stress at early growth stage) were laid out in factorial experiment in a randomized complete block design with two replications. Drought was imposed to the crop for 10 days during 90 days after transplanting (DAT) to 100 DAT. Data were recorded for total chlorophyll content by N, N-dimethylformamide extraction and SCMR on the second fully expanded leaf from the top at 90 DAT, 100 DAT and 110 DAT. Drought significantly reduced chlorophyll content and SCMR. The reduction in chlorophyll content was more severe than SCMR. Similar responses of sugarcane genotypes to drought and well-watered conditions were observed for chlorophyll content and SCMR. The breeding line 03-4-425 and the cultivars KU60-1 were identified as the best genotypes for chlorophyll content and SCMR. The correlation coefficients between chlorophyll content and SCMR were significant under well-watered conditions and the relationships were more strong and consistent under drought and drought relief. The SCMR can be used for evaluation of chlorophyll content under different water regimes.
  B. Suriharn , J. Sanitchon , P. Songsri and T. Kesmala
  Appropriate canopy management and proper application of fertilizer under different growing conditions and agronomic practices can obtain reliable yield of physic nut (Jatropha curcas L.). The objective of this study was to determine the effects of pruning level in first year and fertilizer rate of combined NPK in the first and second years on growth and yield of three-year old physic. A split plot design with four replications was used. Three pruning levels of 50, 75 and 90 cm from the ground were assigned in main plots and combinations of NPK fertilizers at the rates of 0, 312.5 and 625 kg ha-1 were arranged randomly in subplots. All pruning levels from the ground did not have significant effects on branch number and branch length (cm), whereas application of fertilizer did increase branch number and branch length especially at the rate of 312.5 kg ha-1. Harvest in the second year gave higher yield (1,559 kg ha-1) than did in the first year (1,180 kg ha-1) for all treatments, suggesting that it is not necessary to prune physic nut every year in commercial plantations. It is recommended to prune the three-year old physic nut at 70 cm from the ground. Pruning at 90 cm from the ground is possible but not at 50 cm. it is also recommended to apply fertilizer to the three-year old physic nut under rainfed conditions at the rate not exceeding 312.5 kg ha-1 and this should be based on soil analysis. Application of higher rates depressed yield.
  P. Songsri , B. Suriharn , J. Sanitchon , S. Srisawangwong and T. Kesmala
  Narrow genetic base is a main problem hindering the progress of physic nut breeding. The objective of this study was to compare the effects of different levels of gamma radiation on germination percentage, survival percentage and growth of five physic nut genotypes. The seeds were treated with six levels of gamma radiation (0, 200, 400, 600, 800 and 1000 Gy) and the 5x6 treatment combinations were arranged in a randomized complete block design with three replications. Data were recorded for germination percentage, survival percentage at 15 Days After Germination (DAG) (GR50(15)) and survival percentage at 30 DAG (LD50(30)). As the seedlings did not survive at 600, 800 and 1000 Gy, these treatments were deleted from the successive evaluations of plant height, stem diameter and leaf number. Higher doses of gamma radiation resulted in the significant reductions in germination percentage, survival percentage and plant height. The germination percentages were from 4.0% for 1000 Gy to 82.5% for 0 Gy. The seeds treated with gamma radiation higher than 600 Gy resulted in complete mortality. Difference among genotypes was not significant for these characters. The dosages of gamma radiation to obtain LD50 based on survival percentage 30 DAG was 425 Gy and was not dependent on genotypes. The information is useful for gamma radiation induction of mutation breeding for physic nut.
 
 
 
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