US 2022/0022394 A1Published application

Aseptic Sowing And Raising Seedling Method For Distant Hybridization Seeds Of Phalaenopsis And Rhynchostylis Retusa

AssigneeEnvironmental Horticulture Research Institute of Guangdong Academy of Agricultural Sciences

InventorsHeming Chen, Fubing Lv, Wenfang Xiao, Zuo Li

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Abstract

The disclosure provides an aseptic sowing and raising seedling method for distant hybridization seeds of Phalaenopsis and Rhynchostylis retusa, which takes Phalaenopsis as female parent and Rhynchostylis retusa as male parent to obtain hybridization fruit pods by artificial pollination, the fruit pods are pretreated, and the seeds are aseptically sowed, germinated, protocorm proliferated and differentiated, strong seedlings rooted, acclimatized and transplanted to obtain distant hybridization offspring groups. The disclosure has the advantages of high seed germination rate, large seedling number, short seedling time and good seedling quality, which solves the problems that the seeds of Phalaenopsis distant hybridization process are difficult to succeed due to affinity, and are extremely difficult to germinate and raise seedlings under natural conditions. Therefore, a large number of seedlings can be obtained in a short period by aseptic sowing and artificial propagation, which lays a foundation for breeding excellent varieties of Phalaenopsis distant hybridization.

An aseptic sowing and raising seedling method for distant hybridization seeds of Phalaenopsis and Rhynchostylis retusa, comprising:

(a) artificial pollination:
taking Phalaenopsis as female parent and Rhynchostylis retusa as male parent for hybridization, selecting fresh and vigorous flowers, removing pollen mass on lip and gynostemium of the female parent with sterilized tweezers, and taking fresh pollen mass of the male parent and placing them in pistil cavity of the female parent;
after pollination for 100-120 days, harvesting uncracked mature fruit pods for aseptic sowing;
(b) pretreatment of fruit pods and seed sowing:
washing the fruit pods with flowing water, scrubbing the fruit pods with 75% alcohol on an ultra-clean bench, sterilizing the fruit pods with 0.1% HgCl2 solution for 10-12 min, washing the fruit pods with sterile water for 3-5 times, cutting the fruit pods after absorbing residual water with sterile filter paper, and sowing the seeds on germination medium for cultivation;
(c) seed germination:
sowing the seeds on the germination medium for cultivation at 25-28° C., with dark or scattered light in early stage, light intensity of 1000-1500 lx (cool-white fluorescent) in later stage and illumination time of 12 h/d;
(d) protocorm proliferation and differentiation:
after the seeds germinating into peak green protocorm, transferring the protocorm to proliferation and differentiation culture medium for cultivation at 25-28° C., with light intensity of 1500-2000 lx (cool-white fluorescent) and illumination time of 12 h/d;
(e) rooting culture of strong seedlings:
carefully cutting off the seedlings differentiated from protocorm, and transferring the seedlings to rooting medium for strong seedlings at 25-28° C., with light intensity of 1500-2000 lx (cool-white fluorescent) and illumination time of 12 h/d;
and
(f) acclimatization and transplantation:
when there are 2-4 leaves, with leaf length of 3-5 cm, leaf width of 1-2 cm, and 2-4 roots, with root length of 2-5 cm, putting the seedlings into a greenhouse with natural light scattering for acclimatization, temperature of acclimatization greenhouse is controlled at 22° C.-28° C., and the seedling can be transplanted out of a bottle after acclimating for 20-30 days;
keeping the planting temperature at 22-28° C. and humidity at 60-70%;
wherein the germination medium is Hyponex®:
3.0 g/L+6-BA(6-benzylaminoadenine) 2.0 mg/L+NAA (naphthalene acetic acid) 1.0 mg/L+10.0% coconut milk+sucrose 30 g/L+agar 7 g/L, with the pH of 5.5-5.8;
wherein the proliferation and differentiation medium is Hyponex®:
3.0 g/L+6-BA(6-benzylaminoadenine) 2.0 mg/L+Ad(adenine) 2.0 mg/L+10.0% coconut milk+sucrose 30 g/L+agar 7 g/L, with the pH of 5.5-5.8;
and
wherein the rooting medium for strong seedlings is Hyponex®:
3.0 g/L+NAA (naphthalene acetic acid) 0.5 mg/L+10.0% coconut milk+sucrose 30 g/L+agar 7 g/L, with the pH of 5.5-5.8.

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Abstract

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