scholarly journals EVALUATION OF AGRONOMIC PERFORMANCE OF DROUGHT - TOLERANT QTL INTROGRESSION HYBRIDS OF MILLET (Pennisetum glaucum L R. BR.) IN THE GUINEA SAVANNAH ZONE OF GHANA

2013 ◽  
Vol 5 (1) ◽  
pp. 354-358 ◽  
Author(s):  
DEMUYAKOR B ◽  
◽  
GALYUON I ◽  
KYEREH S ◽  
AHMED M
Keyword(s):  
Pennisetum Glaucum ◽  
Agronomic Performance ◽  
Drought Tolerant ◽  
Savannah Zone ◽  
Qtl Introgression

scholarly journals Agronomic Performance and Flowering Behavior in Response to Photoperiod and Vernalization in Barley (Hordeum vulgare L.) Genotypes with Contrasting Drought Tolerance Behavior

2021 ◽  
Author(s):  
Jamal Abu-Elenein ◽  
Rabea Al-Sayaydeh ◽  
Zahera Akkeh ◽  
Zakaria Al-Ajlouni ◽  
AbdRaheem A. Al-Bawalize ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Agronomic Performance ◽  
Short Day ◽  
Drought Tolerant ◽  
Long Day ◽  
Meristem Development ◽  
Rainfed Conditions ◽  
Barley Genotypes

Abstract Background In barley, flowering behavior is a highly regulated and complex process where the appropriate matching of reproductive development with seasonal variation in water availability confer barley adaptation to different environments. In this study, the role of variation in flowering time and drought tolerance in four selected barley genotypes was studied under field and controlled conditions. For this purpose, field trials were conducted for two consecutive seasons at three diverse environments where the studied genotypes were subjected to either rainfed conditions or rainfed plus supplementary irrigation under two different sowing dates. Furthermore, reproductive meristem development in two selected barley genotypes, Rum (drought tolerant) and Steptoe (drought-sensitive) was also assessed in response to both vernalization and water stress under two different photoperiod conditions.Results Variation in the number of days to heading was more pronounced under rainfed conditions than under well water conditions. For agronomic performance, Rum was superior under all tested environments, which assure its general adaptability to multiple environments, while Steptoe was the poorest. The transition to reproductive meristem was faster under vernalized long-day conditions as compared to vernalized short-day conditions. The progress of shoot apical meristem development and heading under long-day conditions was significantly faster in Rum than that of Steptoe. A clear effect of drought stress was observed on shoot apical meristem development in Steptoe. Under short-day conditions, vernalized Rum plants subjected to water deficit showed an advanced meristem development stage a significant earlier HD when compared with non-stressed plants. This early flowering behavior in stressed Rum plants under short-day conditions was accompanied by higher gene expression of the Vrn-H1 gene. Conclusion In conclusion, the integration of vernalization and photoperiod signals in drought-tolerant barley genotypes is associated with early flowering behavior and higher productivity in dry environments.

The influence of drought stress on growth, yield and yield components of selected maize genotypes

2003 ◽  
Vol 141 (1) ◽  
pp. 43-50 ◽  
Author(s):  
A. Y. KAMARA ◽  
A. MENKIR ◽  
B. BADU-APRAKU ◽  
O. IBIKUNLE
Keyword(s):  
Grain Yield ◽  
Water Deficit ◽  
Yield Components ◽  
Central Africa ◽  
Growth Yield ◽  
Drought Tolerant ◽  
Maize Genotypes ◽  
Yield And Yield Components ◽  
West And Central Africa ◽  
Savannah Zone

The risk of drought is high in the Sudan savannah zone of West and Central Africa because rainfall in this area is unpredictable in quantity and distribution. Thus, improved maize genotypes tolerant to drought could stabilize maize grain yield in this zone, where recurrent drought threatens grain production. Six maize genotypes, two each of hybrids, open-pollinated varieties (OPVs) and landraces, were evaluated for tolerance to terminal water deficit before flowering. Water deficit significantly reduced growth, grain yield and yield components of the maize genotypes. Significant differences were observed among genotypes for all the traits measured. One hybrid, 9011-30, and two improved OPVs, STR-EV-IWD and IYFD-C0, that showed tolerance to water stress recorded higher grain yield, and accumulated and partitioned more assimilates to the grain than the drought-susceptible genotypes. Also the drought-tolerant genotypes, 9011-30, STR-EV-IWD and IYFD-C0 had more ears/plant and greater numbers of kernels/ear. These genotypes could serve as sources of drought tolerance for the development and improvement of new drought-tolerant maize genotypes.

scholarly journals The Use of a Tomato Landrace as Rootstock Improves the Response of Commercial Tomato under Water Deficit Conditions

Agronomy ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 748
Author(s):  
Mateu Fullana-Pericàs ◽  
Miquel À. Conesa ◽  
Miquel Ribas-Carbó ◽  
Jeroni Galmés
Keyword(s):  
Plant Growth ◽  
Water Deficit ◽  
Isotope Composition ◽  
Fruit Production ◽  
Agronomic Performance ◽  
Cultivation Conditions ◽  
Water Demands ◽  
Drought Tolerant ◽  
Use Efficiency ◽  
Tomato Landrace

Grafting onto drought tolerant rootstocks has been proposed as a useful strategy to overcome future water scarcity periods. The ‘de Ramellet’ tomato is a drought tolerant landrace selected under semiarid Mediterranean summer conditions under rain-fed or low irrigation. In this manuscript, the responses of a commercial hybrid ‘de Ramellet’ genotype grafted onto a traditional ‘de Ramellet’ (RL) and a commercial Maxifort (Mx) tomato rootstocks under commercial greenhouse conditions are studied. Non-grafted (NON) and self-grafted (SELF) plants were used as controls. Two water regimes were established: well-watered (WW, covering plant water demands) and water deficit (WD, reducing 50% irrigation as compared to WW). The results confirm an improvement in agronomic performance of Mx as compared to NON, but also show a similar improving effect of RL. Grafting enhanced plant growth regardless of the rootstock under WW conditions. Similarly, water-use efficiency (assessed as leaf carbon isotope composition) increased in grafted plants under WD treatment as compared to NON. Despite the lack of significant differences, RL tended to promote higher fruit production and fruit number than Mx, irrespective of the water treatment, whereas RL was the single graft combination with higher fruit production than NON under WD. In conclusion, the results uncover the potential of drought-adapted landraces to be used as rootstocks in order to increase plant growth and fruit production under both well-watered and water deficit cultivation conditions.

scholarly journals Screening of Pearl Millet Genotypes Suitable for Drought Tolerance at Early Seedling Stage

2021 ◽  
Author(s):  
R.C. Meena ◽  
Supriya Ambawat ◽  
C. Tara Satyavathi ◽  
Moola Ram ◽  
Vikas Khandelwal ◽  
...  
Keyword(s):  
Water Stress ◽  
Drought Tolerance ◽  
Pearl Millet ◽  
Pennisetum Glaucum ◽  
Climatic Factors ◽  
Crop Improvement ◽  
Seedling Stage ◽  
Drought Tolerant ◽  
Early Seedling ◽  
Improvement Programs

Background: Pearl millet [Pennisetum glaucum (L.) Br.] is the most widely grown staple food of majority of poor and small land holders in Asia and Africa. It is also consumed as feed and fodder for livestock. It is the sixth most important cereal crop in the world next to maize, rice wheat, barley and sorghum. The temperature is one of the key climatic factors and has profound effect on the growth and development of the pearl millet. It can only be managed through developing hybrid varieties which can tolerate high temperature during germination and early seedling stages.The present study aimed to identify drought tolerant genotypes of pearl millet at seedling stage. Methods: This experiment was carried out at Mandor during kharif 2018 with five selected pearl millet advanced hybrids MH 2192, MH 2224, MH 2228, MH 2354 and MH 2359 along with three checks RHB 177, MPMH 17 and 86M86 which were tested under polyethylene glycol (PEG) (5% and 10%) induced osmotic stress. Various physiological parameters were recorded 15 days after sowing and statistical analysis made using Windostat software. Result: The results revealed that shoot length, seedling dry weight, relative water content, membrane stability index and chlorophyll content decreased significantly with PEG induced water stress in all the hybrids while root length and catalase activity increased significantly under water stress. Among 5 hybrids, two hybrids viz. MH 2359 and MH 2354 performed better and found to be superior under PEG induced water stress. Thus, various drought tolerance indices may further be studied for these two hybrids and can be used in development of drought tolerant genotypes which may prove helpful for crop improvement programs of pearl millet.

scholarly journals Agronomic performance of improved pearl millet cultivars in southern Chad

2021 ◽  
Vol 14 (9) ◽  
pp. 2980-2991
Author(s):  
Gapili Naoura ◽  
Nerbéwendé Sawadogo ◽  
Nadjiam Djirabaye ◽  
Mahamat Alhabib Hassane
Keyword(s):  
Pearl Millet ◽  
High Performance ◽  
Pennisetum Glaucum ◽  
Human Consumption ◽  
Poor People ◽  
Research Station ◽  
Agronomic Performance ◽  
Dry Land ◽  
Days To Flowering ◽  
Significant Difference

Pearl millet [Pennisetum glaucum (L.) R. Br.] is a vital staple food crop for poor people in dry-land areas. It plays an important role on human consumption in South of Chad where farmers always used landraces with a little adoption of improved cultivars. Evaluation of agronomic performance of inbred cultivars at research station is important to identify the high performance genotype to be released as new cultivars in farmer area. So, five improved varieties associated with a well-known variety from research were evaluated for ten agronomical traits. Experiment was carried out during rainy season of 2019 at the research station of Bébédjia, South of Chad. The results of the analysis of variance of assessed traits showed high significant differences (p<0.001) for spike girth and slight significant difference (p<0.05) for days to flowering, thousand seeds weight and productive tillers per plant. An important positive and significant correlations were also noted between day to flowering and number of grains per plot (r = 0.7; p<0.01), seed weight per plot (0.684; p<0.01) and potential grain yield (r = 0.684; p<0.01). Moreover, three cultivars with an important potential grains yield namely ICMV167006 (4.99 t.ha−1), ICMV 167005 (4.68 t.ha−1) and ICMV177111 (3.98 t.ha−1) were identified. Otherwise, for the days to flowering, the cultivars ICMV167006 (73.67 days), ICMV 167005 (75.33 days) are earlier than ICMV 177 111 (78.67 days). These cultivars could be proposed to be released in farmer area as novel cultivars.

scholarly journals Agronomic Performance and Flowering Behavior in Response to Photoperiod and Vernalization in Barley (Hordeum vulgare L.) Genotypes with Contrasting Drought Tolerance Behavior

2021 ◽  
Author(s):  
Jamal Abu-Elenein ◽  
Rabea Al-Sayaydeh ◽  
Zahera Akkeh ◽  
Zakaria Al-Ajlouni ◽  
AbdRaheem A. Al-Bawalize ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Agronomic Performance ◽  
Short Day ◽  
Drought Tolerant ◽  
Long Day ◽  
Meristem Development ◽  
Rainfed Conditions ◽  
Barley Genotypes

Abstract In dry environments, the appropriate matching of reproductive development with water availability is considered very crucial for crop success. In this study, the role of variations in flowering time and drought tolerance in selected barley genotypes with contrasting drought tolerance behavior was studied under field and controlled conditions. For this purpose, field trials were conducted for two consecutive seasons at three diverse locations where the studied genotypes were subjected to either rainfed conditions or rainfed plus supplementary irrigation under two different sowing dates. Furthermore, reproductive meristem development was assessed in two selected barley genotypes, Rum (drought tolerant) and Steptoe (drought-sensitive), in response to both vernalization and water stress under two different photoperiod conditions. Variation in the number of days to heading was more pronounced under rainfed conditions than under well-water conditions. For agronomic performance, Rum was superior under all tested environments, which assures its general adaptability to dry environments. Under controlled conditions, the transition to reproductive meristem was faster under vernalized long-day conditions compared to vernalized short-day conditions. The progress of shoot apical meristem development and heading under long-day conditions was significantly faster in Rum compared to Steptoe. A pronounced effect of drought stress was observed on shoot apical meristem development in Steptoe. Under short-day conditions, vernalized Rum plants subjected to drought showed an advanced meristem development stage and a significantly earlier heading compared to non-stressed plants. This early heading in stressed Rum plants under short-day conditions was accompanied by higher gene expression of the Vrn-H1 and Vrn-H3 genes. In conclusion, the integration of vernalization and photoperiod signals in drought-tolerant barley genotypes was associated with early flowering time and higher productivity in dry environments.

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