Evaluating Effects of Plant Growth-Promoting Rhizobacteria on Yield and Yield Components of Bean (Phaseolus Vulgaris L.) under Water Deficit Stress Condition

Abstract

The purpose of this study was to assess how various irrigation levels and dosages of plant growth-promoting rhizobacteria (PGPR) affected the yield, yield components, and certain morphological traits of bean (Phaseolus vulgaris L.) plants cultivated in the field. The growth seasons of 2021 and 2022 were used for the experiment. 40% (I40), 70% (I70), and 100% (I100) of Class A pan evaporation served as the basis for the irrigation levels. Starting at 10-day intervals following sowing, the PGPR treatments were applied at four frequencies: R0 (control), R1 (once), and R3 (three times). The parameters evaluated in the trial included pod yield, pod weight, plant height, pod length, number of leaves, stem diameter, fresh and dry root weight, 1000-seed weight and number of seeds per pod. Plant growth was significantly impacted by both PGPR treatments and irrigation levels, according to statistical analyses (p < 0.05). According to the results obtained; pod yield was 321–1159 g m⁻², pod weight was 8.87–14.66 g, pod length was 8.50–15.33 cm, plant height was 30.01–65.23 cm, stem diameter was 10.51–16.54 mm, number of leaves 12.78–43, fresh root weight 12.78–43.05 g, dry root weight 3.21–11.61 g, seed number per pod 2.01–6.66, and 1000-seed weight 196.14–536.96 g. The lowest values for many parameters were recorded in the control group (I40R0) where water stress was highest and no bacterial application was made. In contrast, the highest values were obtained in the group that received full irrigation and was treated with the highest dose of PGPR (I100R3). The findings indicate that PGPRs play an important role in supporting plant growth and reducing the negative effects of drought stress.

Keywords

• Deficit irrigation
• plant growth-promoting rhizobacteria
• bean (Phaseolus vulgaris L.)

Supporting Institution

No funding was received for this research.

Ethical Statement

The ethical approval is not required for this study because it is based solely on plant experiments conducted under standard agricultural research conditions.

Su kısıtı stresi koşulları altında fasulye (Phaseolus Vulgaris L.) bitkisinin verimi ve verim bileşenleri üzerindeki bitki büyümesini teşvik eden rizobakterilerin etkilerinin değerlendirilmesi

Abstract

Bu çalışmanın amacı, tarlada yetiştirilen fasulye (Phaseolus vulgaris L.) bitkilerinin verimi, verim bileşenleri ve bazı morfolojik özelliklerinin çeşitli sulama seviyeleri ve bitki büyümesini teşvik eden rizobakteri (PGPR) dozlarıyla nasıl etkilendiğini değerlendirmektir. Deney için 2021 ve 2022 büyüme sezonları kullanılmıştır. Sulama seviyeleri için temel olarak A sınıfı buharlaşmanın %40'ı (I40), %70'i (I70) ve %100'ü (I100) kullanılmıştır. Ekimden sonra 10 günlük aralıklarla, PGPR uygulamaları dört farklı sıklıkta yapılmıştır: R0 (kontrol), R1 (bir kez) ve R3 (üç kez). Deneyde değerlendirilen parametreler arasında bakla verimi, bakla ağırlığı, bitki boyu, bakla uzunluğu, yaprak sayısı, gövde çapı, taze ve kuru kök ağırlığı, 1000 tohum ağırlığı ve bakla başına tohum sayısı yer almaktadır. İstatistiksel analizlere göre (p < 0,05), bitki büyümesi hem PGPR uygulamalarından hem de sulama seviyelerinden önemli ölçüde etkilenmiştir. Elde edilen sonuçlara göre; bakla verimi 321–1159 g m⁻², bakla ağırlığı 8,87–14,66 g, bakla uzunluğu 8,50–15,33 cm, bitki yüksekliği 30,01–65,23 cm, gövde çapı 10,51–16,54 mm, yaprak sayısı 12,78–43, taze kök ağırlığı 12,78–43,05 g, kuru kök ağırlığı 3,21–11,61 g, bakla başına tohum sayısı 2,01–6,66 ve 1000 tohum ağırlığı 196,14–536,96 g olmuştur. Birçok parametre için en düşük değerler, su stresinin en yüksek olduğu ve bakteri uygulaması yapılmayan kontrol grubunda (I40R0) kaydedilmiştir. Buna karşılık, en yüksek değerler tam sulama yapılan ve en yüksek dozda PGPR (I100R3) ile muamele edilen grupta elde edildi. Bulgular, PGPR'lerin bitki büyümesini desteklemede ve kuraklık stresinin olumsuz etkilerini azaltmada önemli bir rol oynadığını göstermektedir.

Keywords

• Kısıtlı sulama
• bitki büyümesini teşvik eden rizobakteriler
• fasulye (Phaseolus vulgaris L.)

Supporting Institution

Bu araştırma için herhangi bir finansman desteği alınmamıştır.

Ethical Statement

Bu çalışma, tamamen standart tarımsal araştırma koşulları altında yürütülen bitki deneylerine dayandığı için etik onay gerekmemektedir.

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