Low temperature and drought stress are the major constraints in rice productivity worldwide. This study investigated the influence of low soil temperature and/or drought stress on physiology and pollen traits of two r...Low temperature and drought stress are the major constraints in rice productivity worldwide. This study investigated the influence of low soil temperature and/or drought stress on physiology and pollen traits of two rice genotypes viz., Guinongzhan and Yueza 763 at flowering stage. The experiment included four treatments, i.e., under the greenhouse natural growth conditions (UC) taken as control, drought stress (DS), the soil water potential was kept at ?0.035 to ?0.045 MPa (DS), low soil temperature (LT) maintained at 19 to 21℃, combined LT and DS (LT+DS, LD). Results showed that LT, DS, and LD substantially reduced net photosynthetic rate (Pn) and the maximal photochemical efficiency of PSII (Fv/Fm), whilst transpiration rate (Tr) was markedly enhanced by under LT in both rice genotypes. The malondialdehyde (MDA) contents were enhanced under LT, DS, and LD in Guinongzhan, whilst the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were regulated by LT, DS, and LD in both rice genotypes. Furthermore, anther dehiscence rate, pollen numbers on stigma, pollen viability and pollen germination rate, and anther starch contents were obviously reduced under LT and DS of both rice genotypes. Stress conditions substantially reduced the yield and yield components, i.e., effective panicles, seed set percentage, grain/panicles, 1000-grain weight, and grain yield of both genotypes and the effects were more apparent in Guinongzhan than those in Yueza 763 whilst combined LT and DS proved more damaging than individual stress.展开更多
A field investigation was executed in sugarcane producing area of Zhanjiang,Guangdong Province with YT03-373 as the test variety to understand the possible impacts of seaweed extracts on phenology,yield and quality at...A field investigation was executed in sugarcane producing area of Zhanjiang,Guangdong Province with YT03-373 as the test variety to understand the possible impacts of seaweed extracts on phenology,yield and quality attributes of sugarcane. Foliar application of seaweed extracts were carried out on sugarcane at seedling and tillering stages. Agronomic traits,yield,sugar content,leaf drought resistance and pest resistance of sugarcane were analyzed for optimization of application time at proper phenological stages. The results that compared to the control,the application of seaweed extracts at different stages of sugarcane enhanced production of sugarcane with increase rate of 10. 83%-12. 87%,and improved theoretical sugar yield of sugarcane up to 1. 9 t/ha while enhancing water retention capacity and water content of sugarcane leaves that consequently led to wilting risk reduction by escaping drought and improved resilience to drought impact on sugarcane. Seaweed extracts also performed excellent in pest management of sugarcane,and they exerted different control effects on sugarcane borers,aphids and thrips. An increase in output of sugarcane was observed to be 15. 09% compared to control,while the net income was improved by up to 32. 64% in the seaweed extracts application treatment. Foliar application of seaweed extracts not only enhanced growth,cold resistance,pest resistance,output value but also improved economic returns,giving a positive affirmation for the recommendation of seaweed extract application.展开更多
基金supported by the National Natural Science Foundation of China (31271646)the Natural Science Foundation of Guangdong Province, China (8151064201000017)+1 种基金the Agricultural Research Projects of Guangdong Province, China (2011AO20202001)the Agricultural Standardization Project of Guangdong Province, China (4100 F10003)
文摘Low temperature and drought stress are the major constraints in rice productivity worldwide. This study investigated the influence of low soil temperature and/or drought stress on physiology and pollen traits of two rice genotypes viz., Guinongzhan and Yueza 763 at flowering stage. The experiment included four treatments, i.e., under the greenhouse natural growth conditions (UC) taken as control, drought stress (DS), the soil water potential was kept at ?0.035 to ?0.045 MPa (DS), low soil temperature (LT) maintained at 19 to 21℃, combined LT and DS (LT+DS, LD). Results showed that LT, DS, and LD substantially reduced net photosynthetic rate (Pn) and the maximal photochemical efficiency of PSII (Fv/Fm), whilst transpiration rate (Tr) was markedly enhanced by under LT in both rice genotypes. The malondialdehyde (MDA) contents were enhanced under LT, DS, and LD in Guinongzhan, whilst the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were regulated by LT, DS, and LD in both rice genotypes. Furthermore, anther dehiscence rate, pollen numbers on stigma, pollen viability and pollen germination rate, and anther starch contents were obviously reduced under LT and DS of both rice genotypes. Stress conditions substantially reduced the yield and yield components, i.e., effective panicles, seed set percentage, grain/panicles, 1000-grain weight, and grain yield of both genotypes and the effects were more apparent in Guinongzhan than those in Yueza 763 whilst combined LT and DS proved more damaging than individual stress.
基金Supported by Guangdong Provincial Science and Technology Plan(2017A070701030,2017B030314123)Earmarked Fund for China Agriculture Research System(CARS-170203)+1 种基金Project of Guangdong Academy of Sciences(2017GDASCX-0105),2019GDASYL-0104012)Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences(1630052019001)
文摘A field investigation was executed in sugarcane producing area of Zhanjiang,Guangdong Province with YT03-373 as the test variety to understand the possible impacts of seaweed extracts on phenology,yield and quality attributes of sugarcane. Foliar application of seaweed extracts were carried out on sugarcane at seedling and tillering stages. Agronomic traits,yield,sugar content,leaf drought resistance and pest resistance of sugarcane were analyzed for optimization of application time at proper phenological stages. The results that compared to the control,the application of seaweed extracts at different stages of sugarcane enhanced production of sugarcane with increase rate of 10. 83%-12. 87%,and improved theoretical sugar yield of sugarcane up to 1. 9 t/ha while enhancing water retention capacity and water content of sugarcane leaves that consequently led to wilting risk reduction by escaping drought and improved resilience to drought impact on sugarcane. Seaweed extracts also performed excellent in pest management of sugarcane,and they exerted different control effects on sugarcane borers,aphids and thrips. An increase in output of sugarcane was observed to be 15. 09% compared to control,while the net income was improved by up to 32. 64% in the seaweed extracts application treatment. Foliar application of seaweed extracts not only enhanced growth,cold resistance,pest resistance,output value but also improved economic returns,giving a positive affirmation for the recommendation of seaweed extract application.
