Evaluation of Yield and Morphophysiological Characteristics of Sugar Beet in Response to Putrescine and Spermidine Application under Drought Stress

Yıl 2026, Cilt: 23 Sayı: 1, 101 - 118, 07.01.2026

Mahdi Abbaszadeh , Reza Sadrabadi Haghighi , Ali Bagherzadeh , Amir Salari , Seyed Mosfata Hoseini Mazinani

https://doi.org/10.33462/jotaf.1589695

https://izlik.org/JA97JL63MX

Öz

Drought stress poses a major global challenge for sugar beet crops. Applying polyamines (PAs) may offer a promising solution by enhancing the drought resistance of these plants. With the main objective to explore how foliar treatment with PAs impacts various qualitative and morphophysiological traits, a three-replicate split-plot experiment based on a randomized complete block design was conducted during 2020-2021 to evaluate how polyamine foliar applications affect sugar beets root yield, quality parameters, and morphophysiological characteristics under water-limited conditions. The main plots consisted of three irrigation levels (100% (I1), 75% (I2), and 50% (I3) of water requirement), while sub-plots received foliar treatments of putrescine (PUT) and spermidine (SPD) at concentrations of 0.5 and 1 millimolar for each of them, with distilled water serving as the control. In the study, polyamines were applied to sugar beet leaves in 3 three stages: at 8 leaves, 12-16 leaves, and 20-24 leaves. Statistical analysis revealed that irrigation treatments, polyamine foliar applications, and their interactions had significant effect on root yield (RY), α-amino-N content, leaf area index (LAI), total plant dry weight (TPDW), leaf greenness (SPAD), relative water content (RWC), and water use efficiency (WUE). Additionally, white sugar yield (WSY) and Proline content showed significant responses to these treatments. Applying 1 millimolar PUT at irrigation level I2 increased LAI, TPDW, RWC, SPAD, RY, and WSY by 21.1, 28.3, 21.8, 35.3, 27.7, and 47.5 percent, respectively, in comparison to the untreated control group, While PUT 1 millimolar treatment at irrigation level I3 led to a 62% increase in Proline. In general, foliar application with the tested polyamines significantly improved the morphophysiological, quantitative, and qualitative properties. Notably, when polyamines were administered under mild stress conditions, WSY of sugar beet increased, while also achieving water savings.

Anahtar Kelimeler

Drought stress , Osmotic adjustment , Proline , Root yield , White sugar yield

Etik Beyan

There is no need to obtain permission from the ethics committee for this study.

Kaynakça

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