제목 | Effect of chilling acclimation on germination and seedlings response to cold in different seed coat colored wheat (Triticum aestivum L.) |
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내용 |
Background: Flavonoids can protect plants against extreme temperatures and ROS due to their antioxidant activities. We found that deep-purple seed coat color was controlled by two gene interaction (12:3:1) from the cross
between yellow and deep-purple seed coat colored inbreds. F2:3 seeds were grouped in 3 by seed coat color and germinated under chilling (4 °C) and non-acclimated conditions (18 °C) for a week, followed by normal conditions (18 °C)
for three weeks and a subsequent chilling stress (4 °C) induction. We analyzed mean daily germination in each group.
Additionally, to study the acclimation in relationship to the diferent seed coat colors on the germination ability and
seedling performances under the cold temperatures, we measured the chlorophyll content, ROS scavenging activity, and expression levels of genes involved in ROS scavenging, favonoid biosynthetic pathway, and cold response in
seedlings.
Results: The results of seed color segregation between yellow and deep purple suggested a two-gene model. In the
germination study, normal environmental conditions induced the germination of yellow-seed, while under chilling
conditions, the germination ratio of deep purple-seed was higher than that of yellow-colored seeds. We also found
that the darker seed coat colors were highly responsive to cold acclimation based on the ROS scavenging enzymes
activity and gene expression of ROS scavenging enzymes, favonoid biosynthetic pathway and cold responsive genes.
Conclusions: We suggest that deep purple colored seed might be in a state of innate pre-acquired stress response
state under normal conditions to counteract stresses in a more efective way. Whereas, after the acclimation, another
stress should enhance the cold genes expression response, which might result in a more efcient chilling stress
response in deep purple seed seedlings.
Low temperature has a large impact on the yield of crops. Thus, understanding the beneft of seed coat color
response to chilling stress and the identifcation of limiting factors are useful for developing breeding strategies in
order to improve the yield of wheat under chilling stress.
Keywords: Cold tolerance, Flavonoids, Low temperature, Purple wheat, ROS
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첨부 |
2021 Flores et al..pdf
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