Response of bread wheat genotypes to drought simulation under a mobile rain shelter in Kenya

Kimurto, P.K.; Kinyua, M. G.; Njoroge, J. M.

doi:10.4314/acsj.v11i3.27572

Cited by 11 publications

(15 citation statements)

References 14 publications

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“…The residuals of both models did not indicate any serial autocorrelation (Box–Pierce test) and they were normally distributed (Shapiro–Wilk test) at 95.0% confidence level. These results are in accordance with findings of previous studies on water stress and drought responses of wheat cultivars (Austin et al ., 1980; Blum, 1998; El Hafid et al ., 1998; Hlavinka et al ., 2009; Kimurto et al ., 2003; Simane et al ., 1993). Moreover, drought effects at the mid-end of the ripening stage of wheat (mid-end of May) were found insignificant even though the lowest values of P/ET o were observed during this stage.…”

Section: Resultsmentioning

confidence: 99%

“…The coefficients of model I were incorporated in the second part of equation (10), which was used to predict all the cases of YG between the years of the period 1980-2004(e.g. for 2004, YG was calculated between 2004and 2003, 2004and 2002,. .…”

Section: Yield Gapmentioning

confidence: 99%

“…The response of winter wheat yields to drought and water stress have been thoroughly investigated by several studies, which have indicated that the vegetative-reproductive stage is more sensitive than the seedling and the tillering stages, not only in arid and semi-arid areas but even in temperate and humid climate conditions (Austin et al ., 1980; Blum, 1998; El Hafid et al ., 1998; Hlavinka et al ., 2009; Kimurto et al ., 2003; Simane et al ., 1993). Combined drought effects during the seedling stage and the reproductive stage accounted for the highest yield reduction (El Hafid et al ., 1998; Kimurto et al ., 2003). The occurrence of drought after sowing or during the seedling stage and the early growth stages lead to partial failure of seed germination and preservation of the young plants (Kimurto et al ., 2003).…”

Section: Introductionmentioning

confidence: 99%

“…in the reproductive stage) leads to lower respiration and photosynthetic rates, kernel shrivelling and lower ability to confront foliar diseases, which tend to spread and intensify towards and after flowering (Blum, 1998). According to Kimurto et al (2003), drought and consequently water stress during the reproductive stage was associated with lower number of seeds per head, increased number of sterile florets per head, reduced number of reproductive tillers, smaller ears, reduced number of spikelets per head and reduced kernel weights.…”

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confidence: 99%

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Modelling Yields of Non-Irrigated Winter Wheat in a Semi-Arid Mediterranean Environment Based on Drought Variability

et al. 2013

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Regression models for the prediction of grain yields of non-irrigated winter wheat in a semi-arid Mediterranean environment were developed based on drought variability. Twenty-five years (1980-2004) of climate data and yield data from four soils (sandy loam, clay, clay loam and sandy clay loam soil) in northern Greece were used for this purpose. Two variables were selected as explanatory variables of the models: (a) the monthly precipitation versus the monthly reference evapotranspiration ratio (P/ETo ), which describes the monthly drought and consequently the water deficit conditions during the wheat-growing season and (b) the mean observed yield ( y) of each soil, which indirectly describes the intrinsic fertility of the soils. A resampling technique using subsets of the data (bootstrapping) was applied to estimate the coefficients of the models, to assess the uncertainty of the selected explanatory variables and to validate the models. The models showed adequate predictive ability of wheat yields, defining the time and intensity of drought effects. The most crucial period for winter wheat was found to be primarily the vegetative-reproductive stage period between late winter and mid-spring (i.e. February to April). Soil clay content was found to be the most representative parameter in describing most of the physico-chemical parameters and properties of the soils and consequently the mean yield, indicating that yield is non-linearly correlated with most soil properties. With the proposed models, yield gap (YG) predictions between two growing seasons of the selected soils presented 84% accuracy in all years in the identification of the correct signal (+ or -) of yield increase or decrease, respectively, and adequate performance in the prediction of the mean YG

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Section: Resultsmentioning

confidence: 99%

Section: Yield Gapmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Modelling Yields of Non-Irrigated Winter Wheat in a Semi-Arid Mediterranean Environment Based on Drought Variability

et al. 2013

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“…Araştırmada tane verimi (Kalaycı ve ark., 1998), başaklanma süresi, çiçeklenme süresi, fizyolojik olum süresi ve tane dolum süresi (Zadoks et al, 1974) parametrelerine ilişkin gözlem ölçümler alınmıştır. Ayrıca, incelenen özelliklerde kuraklık hassasiyet indeksi (Fischer and Maurer, 1978) (Jamal et al, 1996;Kimurto et al, 2003;Öztürk, 1999b) Başaklanma süresi S 2 uygulamasında ortalama 171.9 gün olarak gerçekleşirken, S 1 uygulamasında %1.9 performans kaybı ile 168.6 gün olmuştur. Genotiplerde başaklanma süresi 166.5 gün (Bayraktar 2000) ile 175.5 gün (Dağdaş 94) arasında değişmiştir.…”

Section: Materyal Ve Yöntemunclassified

Ekmeklik Buğday Genotiplerinin Verim ve Fenolojik Özelliklerinin Tane Doldurma Dönemindeki Kuraklık Stresine Tepkileri

Ayranci

Sade

Soylu

2017

Tarla Bitkileri Merkez Araştırma Enstitüsü Dergisi

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ÖzBu çalışmanın amacı Orta Anadolu Bölgesi'nde tane doldurma döneminde görülebilen kuraklık tipinin modellendiği kontrollü tarla şartlarında, ekmeklik buğday genotiplerinin verim ve bazı fenolojik özelliklerinin tepkilerinin belirlenmesidir. Çalışma, Konya'da 2009-2010 yetiştirme yıllarında yağmur korunakları altında, tesadüf bloklarında bölünmüş parseller deneme deseninde, dört tekerrürlü; ana parsellerde uygulamalar (S 1 : Tane doldurma dönemi kuraklığı, S 2 : Tam sulu koşullar) ve alt parsellerde 10 ekmeklik buğday genotipi kullanılarak yürütülmüştür. Çalışmada, genotiplerin verim ve fenolojik özelliklerinin tane doldurma dönemindeki kuraklığa tepkileri değerlendirilmiştir. Çalışmada tane verimi, uygulama ortalamaları olarak 579 kg da -1 (S 1 ) ile 760 kg da -1 (S 2 ) arasında ve stres uygulamaları üzerinden genotiplerde 595 kg da -1 (Göksu 99) ile 725 kg da -1 (BDME 09/1K) arasında değişmiştir. Stres uygulaması, sulu uygulama ile karşılaştırıldığında, tane dolum dönemi kuraklık uygulamasında tane verimi %23.9 oranında azalmıştır. KHİ değerleri 0.58 (Bayraktar 2000) ile 1.73 (Göksu 99) arasında değişmiştir. Bayraktar 2000 çeşidi tane dolum kuraklığına en toleranslı çeşit olarak belirlenmiştir. Fenolojik özelliklerin uygulama ortalamaları olarak, başaklanma süresi 168.6 gün ile 171.9 gün, çiçeklenme süresi 174.2 gün ile 178.1 gün, fizyolojik olum süresi 208.9 gün ile 218.1 gün ve tane dolum süresi 34.7 gün ile 39.9 gün arasında değişim göstermiştir. Stres uygulaması sulu koşullara göre, başaklanma süresinde %1.9; çiçeklenme süresinde %2.2; fizyolojik olum süresinde %4.2; tane dolum süresinde %13 kısalmaya sebep olmuştur. Tane dolum süresi uzun olan çeşitlerin verim değerlerinin yüksek olduğu belirlenmiştir. Bu çalışmada tane doldurma dönemi kurak stresi altında ekmeklik buğday genotiplerinde kuraklığa adaptasyonu desteklediği belirlenen tane doldurma süresi parametresi, geç dönemde etkili olan kuraklık için, toleranslı genotip geliştirmek amacıyla, seleksiyon parametresi olarak kullanılabilir.Anahtar Kelimeler: Kuraklık, buğday, fenolojik özellikler, seleksiyon, parametre The Response on the Drought Stress Yield and Phenological Properties of Bread Wheat Genotypes in Grain Filling Stage AbstractThe aim of this study was to determine the responses of the grain yield and some phenological properties of bread wheat genotypes under controlled field conditions which can be seen in grain filling stage in Central Anatolia Region. This research was conducted to observe the drought resistance of ten bread wheat genotypes at grain filling period. Split-plot in randomized complete block design techniques were used with four replicates in 2009-2010 under rain shelter in Konya Province. Two different irrigation treatments were done in grain filling period drought (S1) and in full irrigation conditions (S2). Results showed that grain yield values varied from 579 (S 1 ) to 760 kg da -1 (S 2 ) under drought treatments, and from 595 (Göksu 99) to 725 kg da -1 (BDME 09/1K). If the means of drought treatment was compared with ir...

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The effects of seasonal climate change on the safflower genotypes productivity under Central Anatolian conditions

Koç

2024

J Americ Oil Chem Soc

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This study aimed to investigate the effect of seasonal climate change on safflower genotypes productivity in Central Anatolian conditions during 2021 and 2022. The research focused on seed yield, oil content, and oil yield, considering variations in growing degree days (GDD) at different growth stages. In both years, seed yield was significantly affected by lack of rainfall. In 2021, safflower genotypes had an average seed yield of 1540 kg ha−1, while in 2022, it increased to 2390 kg ha−1 due to higher rainfall during critical growth stages. Different genotypes showed different performances in seed yield each year, highlighting the importance of selecting drought‐tolerant genotypes for breeding programmes. Oil content also showed significant variations between genotypes and years. Drought stress during flowering and seed filling periods generally led to a decrease in safflower oil content. However, in 2021, despite drought during the seedling stage, there was an increase in average oil content, possibly due to compensatory mechanisms related to reduced seed yield and dry matter content. In addition, the study looked at GDD values at different growth stages and found considerable variation among genotypes in GDD accumulation. Genotypes with higher GDD accumulation tended to have higher seed and oil yields, indicating better stress tolerance. Conversely, early maturing genotypes with lower GDD levels were better suited for regions with lower average temperatures. The results highlight the importance of considering both rainfall and temperature factors when selecting safflower genotypes for specific regions. In conclusion, the study highlights the impact of seasonal climate change on safflower productivity and the need to develop new safflower varieties capable of adapting to the predicted hotter and drier conditions due to climate change.

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Response of bread wheat genotypes to drought simulation under a mobile rain shelter in Kenya

Cited by 11 publications

References 14 publications

Modelling Yields of Non-Irrigated Winter Wheat in a Semi-Arid Mediterranean Environment Based on Drought Variability

Modelling Yields of Non-Irrigated Winter Wheat in a Semi-Arid Mediterranean Environment Based on Drought Variability

Ekmeklik Buğday Genotiplerinin Verim ve Fenolojik Özelliklerinin Tane Doldurma Dönemindeki Kuraklık Stresine Tepkileri

The effects of seasonal climate change on the safflower genotypes productivity under Central Anatolian conditions

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