Registration of ShunMai Triplet Wheat for Flower Development Studies and Embryogenesis Research

ShunMai Triplet (Reg. No. GS‐189, PI 678624) is a winter wheat ( Triticum aestivum L.) that was developed using conventional selection as an F 4:5 progeny line derived from bulked crosses and is of unknown pedigree. ShunMai Triplet has three unique embryogenesis characteristics: (i) between one lemma and one palea, there are three ovaries (a large one and two equally small ones) and three anthers, giving rise to one to three grains in one floret; (ii) it often produces a twin spikelet at one node in the middle part of the rachis, usually with one to two twin spikelets per spike; and (iii) nearly 0.1 to 0.2% (average 0.168%) of the seeds give rise to twin shoots without doubled primary roots during germination. The triplet trait is controlled by a single dominant gene and could be useful for wheat embryology research as well as for flower development studies. ShunMai Triplet has medium maturity, with an average plant height of 80 ± 5 cm. It has a clavate head, white awns about 10 to 11 cm in length, a pale auricle, a pale ligule, pale green glumes with an oblique shoulder, a glume beak approximately 0.9 to 1.1 cm long, white grains of irregular shape, kernel weight of 27 ± 5 mg, broader leaves, thicker stems, moderate resistance to yellow rust, and moderate sensitivity to powdery mildew based on visual observations in the field.