Abstract
Six male sterile lines (MSLs) of ramie (Boeh-meria nivea (L.) Gaud.) were grown in dark rooms under the photoperiods of 9.5h, 11h or 12.5h d-1 in spring and summer seasons (dif-ferent environmental temperatures) to test their developmental response to photoperiod and temperature. The MSLs showed little difference in vegetative growth duration, but different de-velopment rates in the reproductive growth stage under the tested conditions. Higher tem-perature (grown in summer) mainly accelerated vegetative growth, while the short photoperiod treatment accelerated the reproductive growth of the MSLs. Moreover, the short photoperiod treatment combined with higher temperature obviously accelerated both the vegetative and reproductive growth of the MSLs. But the effect of higher temperature decreased, or even dis-appeared along with the photoperiod elongation. The MSLs were divided into 5 photo-temperature response types, based on the flower budding acceleration of short pho-toperiod and the approximate temperature re-sponse index.
Highlights
IntroductionMainly grown in China, the Philippines, Brazil, India and Viet Nam, is one of the most popular textile fiber plants
Male sterility exists in many plant species [1]
The discovery of plant male sterility allowed the use of crop heterosis, resulting in great achievements in crops such as corn, rice, wheat, rape and many vegetables [1,2]
Summary
Mainly grown in China, the Philippines, Brazil, India and Viet Nam, is one of the most popular textile fiber plants. Ramie fabrics are becoming popular all over the world owing the mode of “back to the nature”, which is leading the ramie industry into a new development era. Ramie male sterile plants were found amongst local cultivars in the 1960’s [3]. We investigated the development of ramie MSLs under different photoperiods and temperatures (grown in different seasons), with a view to characterizing their response to photoperiod and temperature. This information will provide guidance for determining cross combinations, assist with the breeding of new cultivars and assist with ramie seed production generally
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