Babak Andalibi; Mansour Faraji; Mohsen Seilsepour; Sajjad Nasiri
Abstract
Objective: Drought stress is one of the most critical limiting factors affecting the overall growth and final yield of common bean. This study specifically aimed to evaluate the combined effects of seed priming and foliar application of ellagic acid on the yield, physiological performance, and biochemical ...
Read More
Objective: Drought stress is one of the most critical limiting factors affecting the overall growth and final yield of common bean. This study specifically aimed to evaluate the combined effects of seed priming and foliar application of ellagic acid on the yield, physiological performance, and biochemical characteristics of common bean under drought stress conditions.Method: A detailed field experiment was conducted in May 2024 using a split-plot design based on randomized complete blocks with three replications at the Central Research Farm affiliated with the Agricultural and Natural Resources Research Center of Tehran Province, located in Varamin County. The main plots consisted of three irrigation levels (full irrigation equivalent to 100% of the crop water requirement, mild stress at 75%, and severe stress at 50%). The subplots included four treatments: control (no priming or foliar application), seed priming with 50 mg L⁻¹ ellagic acid, foliar spraying with 50 mg L⁻¹ ellagic acid, and a combination of seed priming and foliar application. Results: The results clearly showed that drought stress significantly reduced grain yield and biological yield of common bean. However, the application of ellagic acid, especially the combined treatment of seed priming and foliar spraying, effectively improved these traits. The highest grain yield (4198 kg ha⁻¹) was recorded under full irrigation with the combined treatment, whereas the lowest yield (2220 kg ha⁻¹) occurred under severe stress without ellagic acid application, representing a 47.1% decrease. Under mild stress, foliar application alone increased grain yield by 12.5%, and under severe stress, the combined treatment enhanced yield by 22%. Biological yield also increased in response to treatments, with the combined treatment increasing it by 10.5%, 9.5%, and 19.6% compared to the control under full irrigation, mild stress, and severe stress, respectively. Catalase enzyme activity and malondialdehyde content increased under stress condition; however, ellagic acid application, particularly the combined treatment, reduced these indices by 26.1% and 20.9%, respectively.Conclusions: Overall, the results clearly demonstrated that drought stress has a significantly negative impact on the yield and physiological traits of pinto beans. However, the application of ellagic acid—especially in the combined priming and foliar spray treatment—was able to mitigate oxidative stress effects and maintain cellular stability as well as water balance, thereby leading to improved growth and yield under water deficit conditions. Based on these findings, the consistent use of ellagic acid is recommended as an effective management strategy to enhance drought tolerance and sustain productivity in arid and semi-arid regions.
Reza Fifaei; Reza Fotouhi Ghazvini; Behrooz Golein; Yusef Hamidoghli
Abstract
Citrus often were encountered with periodic droughts. For this reason, drought effect on six-month-old seedlings of Poncirus (PT) (Poncirus trifoliata Raf.),Troyer citrange (TC) (Citrus sinensis Osbec. × Poncirus trifoliata Raf.),Citrumello (CR) (Citrus paradisi M. × Citrus sinensis Osbec.),Sour ...
Read More
Citrus often were encountered with periodic droughts. For this reason, drought effect on six-month-old seedlings of Poncirus (PT) (Poncirus trifoliata Raf.),Troyer citrange (TC) (Citrus sinensis Osbec. × Poncirus trifoliata Raf.),Citrumello (CR) (Citrus paradisi M. × Citrus sinensis Osbec.),Sour orange (SO) (Citrus aurantium L.),andCleopatra mandarin (CM) (Citrus reshni L.) were tested on 2014 in Ramsar Citrus Research Institute. This research was conducted as factorial experiment based on completely randomized design with three replications. The factors included commercial Citrus rootstocks and two level of irrigation. The results showed that maximum quantities of proline, total soluble sugars, malondialdehyde and carotenoid and minimum quantities of total, b and a chlorophyll were observed in drought stress. Maximum accumulation of proline (ordered 306.41 and 281.65 µmol/gdw) and total soluble sugars (ordered 233.79 and 137.9 mg/gdw) and minimum accumulation of malondialdehyde (ordered 179.21 and 204.1 µmol/gdw) were observed in SO and CM rootstocks under drought stress. Decreasing amount of total and chlorophyll a in CM and chl b in SO rootstock was more than other rootstocks and decreasing amount of total and b, a chlorophyll in CR was least. Furthermore, increasing amount of carotenoid in SO and CM was most and the least amounts in PT was observed. On the basis of the study, trifoliate rootstocks as Poncirus, Troyer citrange and Citrumello tolerate as much as drought.
mojgan sanjari; Alireza Siroosmehr; Baratali Fakheri
Abstract
To study the effect of humic acid and drought stress on some physiological characteristics of roselle (Hibiscus sabdariffa) an experiment was conducted in the research field of Agricultural Education Centre of Jiroft in 2013. Field experiment was carried out as split plot design with three replications. ...
Read More
To study the effect of humic acid and drought stress on some physiological characteristics of roselle (Hibiscus sabdariffa) an experiment was conducted in the research field of Agricultural Education Centre of Jiroft in 2013. Field experiment was carried out as split plot design with three replications. Water deficit stress as main factor with three levels (A1 = Irrigation after 50, A2 = 100 and A3 = 150 mm evaporation from pan class A) and humic acid was sub plots in four methods of application (B1 = non humic acid, B2 = with irrigation, B3 = with irrigation + once spraying, B4 = with irrigation + twice spraying). Humic acid was used with irrigation at 10kg/ha and for spraying at 250ml/100l. Drought stress had significant effect on chlorophyll a, chlorophyll b, carotenoids, relative humidity content and proline of roselle leaves. Interaction effect of humic acid and drought stress was only significant for total chlorophyll and soluble carbohydrate. Drought stress decreased chlorophyll a (48.22 percent), chlorophyll b (32.77 percent), carotenoid content (79.64 percent) and relative humidity (12.59 percent), while increased proline content (12.59 percent). Humic acid increased chlorophyll a, chlorophyll b and carotenoids but reduced proline content (15.04 percent).
Maryam Haghighi; Hossein Behboudian
Volume 13, Issue 1 , August 2011, , Pages 1-8
Abstract
The world is facing a dwindling supply of water, therefore deficit irrigation is becoming more of a necessity than a choice. Partial rootzone drying (PRD) is a new water saving irrigation technique where at each irrigation time only one part of the rootzone is watered. The un-irrigated part is watered ...
Read More
The world is facing a dwindling supply of water, therefore deficit irrigation is becoming more of a necessity than a choice. Partial rootzone drying (PRD) is a new water saving irrigation technique where at each irrigation time only one part of the rootzone is watered. The un-irrigated part is watered during the next irrigation. We explored the potential of PRD for `Petopride´ processing tomato. There were two treatments: control (C, normal irrigation) and PRD. We collected data on water relations of vegetative and reproductive organs. PRD saved water by 50% and increased water use efficiency of the plant compared to C. Leaf water potential was more negative under PRD compared to C. Irrigated and non-irrigated roots of PRD had similar water potential and this could have happened by water movement between the two sides of root system. Water potential of fruit was lower in PRD than in C. But pressure potential (turgor potential) was similar between PRD and C fruit. This was indicative of osmotic adjustment (osmoregulation) in PRD fruit. To our best knowledge, this is the first report of osmotic adjustment of fruit under PRD treatment.