Ultraviolet-B, end of day light and exclusion effect on photosynthetic efficiency of sweet potato (Ipomoea batatas L.) based on altitude

• Main Authors: Simeneh Tamrat Alemu, Amsalu Gobena Roro
• Format: Article
• Language: English
• Published: University of Birjand 2020-06-01
• Series: Journal of Horticulture and Postharvest Research
• Subjects: +uv-b; uv-b exclusion; uv-b + eod exclusion
• Online Access: http://jhpr.birjand.ac.ir/article_1236_5763912659a42a7f15cdfefaac89083d.pdf

<strong>Purpose:</strong> herbaceous dicot plants mainly sweet potato is highly affected by UV-B and light quality based on altitude. Therefore, this study will give insights on the effect of UV-B and light quality on photosynthetic efficiency of sweet potato based on Altitude. <strong>Research method:</strong> The experimental design was laid out in split plot design with factorial arrangement. The treatments consist of +UV-B or control, UV-B exclusion, UV-B+end of day light exclusion, and the two sweet potato cultivars such as Kulfo and Hawassa-83. <strong>Main findings:</strong> highest UV-B (1693.0mw/m^-2s^-2) was recorded at highland (2230m.a.s.l) and the lowest (1107mw/m^-2s^-2) was recorded at lowland (1400m.a.s.l). The result shows that photosynthetic rate increased by 2.41% in Kulfo compared with Hawassa83 cultivar. Also altitude has a highly significant effect on photosynthetic efficiency; the highest stress level 0.68 and 0.72 was recorded at UV-B + EOD exclusion and highland. This indicate UV-B +EOD exclusion cause light quality and intensity stress at highland also UV-B was inducing high stress at highland area and affecting sweet potato productivity but exclusion increase Fv/Fm and stomata conductance it has no effect on photosynthesis and transpiration rate. <strong>Limitations:</strong> The research has a limitation due to Altitude difference it’s difficult to control factors other than UV-B and light Quality that may cause a difference. <strong>Originality/Value:</strong> This research tries to assess UV-B and end of day time light quality effects due to altitude difference and encourages new research on UV-B, its adaptation and light quality on crop productivity.