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Photosynthesis product allocation and yield in sweetpotato with different irrigation levels at mid-season
Agricultural Water Management ( IF 5.9 ) Pub Date : 2020-12-26 , DOI: 10.1016/j.agwat.2020.106708
Siping Li , Lei Zhao , Ninghui Sun , Qing Liu , Huan Li

Soil water deficit is one of the important factors affecting the source–sink balance of sweetpotato at mid-season growth (storage root initiation period). However, water regulation at mid-season sweetpotato growth is often ignored. In this study, field trials were conducted to diagnose leaves in the middle of sweetpotato growth, and then three mid-season irrigation levels (CK: 0 m3/hm2; W1: 150 m3/hm2; W2: 300 m3/hm2) were established. The effects of different irrigation levels on photosynthetic physiological indexes, 13C transfer allocation, and yield of sweetpotato were studied. The results revealed that mid-season irrigation significantly increased the relative moisture content of sweetpotato leaves, maximum photochemical efficiency (Fv/Fm), and net photosynthetic rate (Pn) (P < 0.05), which effectively alleviated the effects of soil water deficit. The Pn values with irrigation treatments W1 and W2 were significantly higher than those with control (CK) treatment in all three study periods. Among these, the W2 treatment had the highest Pn at 70 d, an increase of 113.4% compared with CK in 2019 test, and W1 had the highest Pn at 110 d and 150 d (P < 0.05). The trend of stomatal conductance (Gs) was basically consistent with Pn. The transpiration rate (Tr) of W2 was the highest at 70 d, an increase of 59.8–69.7% compared with CK, but the Tr of W1 was the highest at 110 d and 150 d. The 13C total accumulation in the W1 treatment was the highest at 70 d, 110 d, and 150 d, when it was 21.9%, 20.4%, and 33.1% higher than that of the W2 treatment in 2019 test (P < 0.05), respectively. The 13C allocation rate of storage roots treated with W1 was the highest in all periods, reaching as high as 73.1–76.1% at 150 d (P < 0.05). At 70 d, the 13C allocation rate of fiber roots and stems was highest in the CK treatment, whereas the 13C allocation rate of leaves was highest in W2 (P < 0.05). At 110 d and 150 d, the 13C allocation rate of stems and leaves in CK was the highest (P < 0.05). The biomass of W2 was the highest at 70 d, but the root-to-shoot ratio and the dry weight of root became gradually lower than those of the CK and W1 treatments at the late season, when they were reduced by 28.4% and 32.2% compared to W1 at 150 d in 2019 test (P < 0.05). The yield of W1 was increased significantly by 33.3–34.9% compared with CK (P < 0.05), but W2 only had an increased production of 14.5–20.7% (P < 0.05) compared to CK (P < 0.05). The irrigation water utilization efficiency of W2 was 59.4–61.8% and 39.1–43.5% lower than those of the CK and W1 treatments (P < 0.05), respectively. Together, these results validate the field sweetpotato mid-season water management model, which is of great significance for guiding actual production of sweetpotato and increasing the potential of sweetpotato.



中文翻译:

不同季节灌溉水平下甘薯光合产物分配和产量

土壤水分亏缺是影响季节中期(贮藏根生期)甘薯源-库平衡的重要因素之一。然而,通常在季节中期,甘薯生长时的水分调节被忽略。在这项研究中,进行了田间试验以诊断甘薯生长中期的叶片,然后诊断三个中期灌溉水平(CK:0 m 3 / hm 2; W 1:150 m 3 / hm 2; W 2:300 m 3 / hm 2)被建立。不同灌溉水平对光合生理指标的影响,13研究了碳转移分配和甘薯的产量。结果表明,中季灌溉显着提高了甘薯叶片的相对含水量,最大光化学效率(F v / F m)和净光合速​​率(P n)(P  <0.05),从而有效地减轻了土壤的影响。缺水。在所有三个研究阶段中,灌溉处理W 1和W 2P n值均显着高于对照处理(CK)的P n值。其中,W 2处理在70 d时具有最高的P n,a n与2019年试验的CK相比增加了113.4%,并且W 1在110 d和150 d时具有最高的P nP  <0.05)。气孔导度(G s)趋势与P n基本一致。W 2的蒸腾速率(T r)在70 d时最高,与CK相比增加59.8〜69.7%,但W 1T r在110 d和150 d时最高。在13中的W C总积累1治疗是在70 d,110 d和150 d最高的,当它是21.9%,20.4%,和33.1%比W的更高2019年测试的2种治疗 分别为(P <0.05)。W 1处理的贮藏根的13 C分配率在所有时期最高,在150 d时高达73.1–76.1%(P  <0.05)。在70 d时,13纤维根C分布速率和茎是在CK治疗最高,而13叶的C分布率最高为W 2P  <0.05)。在110 d和150 d时,CK茎叶的13 C分配率最高(P  <0.05)。W 2的生物量在70 d时最高,但根冠比和根干重在后期逐渐低于CK和W 1处理,分别比CK和W 1处理降低28.4%和32.2%。在2019年测试的第150天W 1P  <0.05)。W的产量1用CK(比较由33.3-34.9%显著增加P  <0.05),但瓦特2只有一个增加的产量的14.5-20.7%(P 相比CK <0.05)(P  <0.05)。W 2的灌溉水利用效率比CK和W 1处理的分别低59.4–61.8%和39.1–43.5%(P <0.05)。总之,这些结果验证了田间甘薯中期水管理模型,对于指导甘薯的实际生产和增加甘薯的潜力具有重要意义。

更新日期:2020-12-26
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