Effects of Flooding on Photosynthesis in Eddo

Abstract

The yield of 'Daikichi', eddo cultivar (Colocasia esculenta Schott (L). var. antiquorum Hubbard & Rehder) cultivar generally grown in upland fields is increased by pot culture under flooded conditions. Here, we studied the effect of flooding on the photosynthesis in eddo under upland field conditions and flooded conditions in which flooding treatment started when two to three leaves emerged. In comparison with upland field conditions, stomatal conductance, transpiration rate, amount of chlorophyll and photosynthetic rate were increased with the plant growth under flooded conditions. The increase in transpiration under flooded conditions prevented the rise of daytime leaf temperature thus preventing the decrease in photosynthetic rate that occurs under high temperature conditions.

Effect of waterlogging on photosynthesis and growth of finger millet (Eleusine coracana)

“…Besides, the present study showed that 33 and 56 days of long-term waterlogging increased SPAD (Figure 3), leading to an increase in P n (Figure 2a). The result is consistent with the finding by Ikezawa et al (2015), who demonstrated an increase in SPAD under 94 and 125 days of waterlogging conditions in Eddo. But contrary to that, Li et al (2011) observed chlorophyll degradation under 30 and 90 days of waterlogging in D. chinense.…”

“…Stomatal density was not affected by waterlogging, and thus it may not be involved in increasing g s (Figures 4 and 5e). Ikezawa et al (2015) reported similar results for Eddo and suggested that enhanced stomatal opening is a possible factor for increasing g s under waterlogging. In contrast, Pereira et al (2020) observed that waterlogging adversely affected the development of stomata in soybean, which is a crop susceptible to waterlogging, resulting in a significant reduction in stomatal density.…”

Effects of flooding cultivation on the composition and quality of taro (Colocasia esculenta cv. Daikichi)

“…The starch content showed a tendency to increase in both raw and steamed mother corm. Photosynthesis was enhanced in the flooding cultivation samples, 10 which, in turn, might have increased the starch content as an assimilation product and affected the physical properties of taro. Furthermore, the tendency of increased stickiness and hardness in mother corms may be responsible for activating starch synthesis during enhanced photosynthesis.…”

“…In this method, water is supplied continuously for only 3 months during the cultivation period, and it maintains productivity without the injuries caused by continuous cropping. Previous studies have shown that the roots of taro grow normally, without moisture damage, and maintain a high rate of photosynthesis under flooding conditions due to the development of aeration tissue in the roots, similar to that in rice, which results in higher yields 10 . Flooding cultivation also suppresses the damage from nematodes or insects (data not published); therefore, it produces high‐quality and healthy seed cormels.…”

“…Previous studies have shown that the roots of taro grow normally, without moisture damage, and maintain a high rate of photosynthesis under flooding conditions due to the development of aeration tissue in the roots, similar to that in rice, which results in higher yields. 10 Flooding cultivation also suppresses the damage from nematodes or insects (data not published); therefore, it produces high‐quality and healthy seed cormels. Despite the reported advantages of flooding cultivation, its effects on taro corm and cormel composition and quality have not been explored.…”