Abstract
Iron chlorine e6 (ICE6), also known as iron dihydroporphine, is a new type natural plant growth regulator, which can improve some crops growth. At present, the effects of ICE6 on rice are still unclear. Therefore, it is of great significance to study the effect of ICE6 on rice growth. In this study, the effect of seed treatment with ICE6 on rice germination and seedling growth was evaluated. Rice seeds were soaked with the gradient concentration and gradient time of ICE6, respectively, and then the germination rate, growth indexes and chlorophyll content of rice were determined. The results showed seed soaking with ICE6 could improve rice seed germination, promote seedling growth and increase the chlorophyll content in plants, exhibiting a better growth promoting effect. The optimum soaking condition was 100–200 mg/L (concentration) and 24–48 h (time). The field experiment further verified the growth regulating effect of ICE6 priming on rice seedlings. After seed priming with ICE6, seed vigor became higher, and the activities of α-amylase and protease in germinating seeds increased. The increase of seed vigor might be an important reason that ICE6 improved the germination and seedling growth. In addition, we also found ICE6 treatment could enhance the regeneration ability of seedlings. This work demonstrated the germination and growth promoting effect of ICE6 on rice, and revealed its application potential in rice production. This seed priming technique was of great promotional value in the field.
Highlights
Rice is an important cereal staple food for a large part of the world population, nearly half of people in the world live on rice, and its yield and quality influence its marketability and the health of people’s life [1]
The germination was inhibited at a high Iron chlorine e6 (ICE6) concentration (2500 mg/L)
The results indicated that seed soaking with appropriate concentration (100–200 mg/L) ICE6 could improve rice seed germination
Summary
Rice is an important cereal staple food for a large part of the world population, nearly half of people in the world live on rice, and its yield and quality influence its marketability and the health of people’s life [1]. The safe production of rice plays a very important role in ensuring world food security. PGRs are a class of chemicals with a similar function as natural plant exogenous hormones, which affect the plants’ physiological and biochemical processes even at extremely low concentrations [4,5,6]. PGRs can modify plant growth and development factors that regulate numerous developmental or metabolic processes, including seeds germination, vegetative growth, flowering, fruit formation, defoliation, etc. Based on their different physiological functions, PGRs are mainly categorized
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