Difference analysis on pseudobulb yields and qualities between Bletilla striata and Bletilla ochracea

Objective In order to supply technical support for growers to select high quality varieties of Bletilla,the difference in pseudobulb yields and qualities between Bletilla striata and B.ochracea was analyzed in this paper.Method Three portions of two-year-old B.striata and one portion of two-year-old B.ochracea were selected as materials.The pseudobulb yields,amino acid contents,protein contents,polysaccharide contents and absorption characteristics of mineral elements including calcium (Ca) were measured and analyzed.The difference in yields among cultivars was compared,and the correlation among indexes including total amino acid contents were analyzed.ResultThere was significant difference in yield among the four materials (P<0.05,the same below).The yield of Ziyuan B.striata'Guibai 4'was 38112.15 kg/ha,which was the highest in all 4 materials,followed by Ziyuan B.striata (29112.15 kg/ha).The yields of Ziyuan B.ochracea and Zunyi B.striata were low.The rank of total amino acid contents was as follows:Zunyi B.striata>Ziyuan B.striata 'Guibai 4'>Ziyuan B.ochracea>Ziyuan B.striata.The protein content of Ziyuan B.striata'Guibai 4'(7.22%) was the highest,followed by Zunyi B.striata(7.12%),Ziyuan B.ochracea(6.60%) and Ziyuan B.striata(5.43%).However,the polysaccharide contents of B.ochracea (31.40%) and Ziyuan B.striata'Guibai 4'(29.70%) were higher,and those of Ziyuan B.striata (27.60%) and Zunyi B.striata (23.60%) were lower.In addition,there were differences in absorption of mineral elements like Ca among the four materials.Variance analysis indicated that total amino acid content and protein content are significantly positively correlated.And they were both positively correlated to the five mineral elements.There was negative correlation between polysaccharide and all indexes except Mg content.The correlation among the five mineral elements were positive or negative.Conclusion There are differences in pseudobulb qualities and yields between B.striata and B.ochracea,and also between different varieties(or those come from different regions) ofB.ochracea.The yield and quality of Ziyuan B.striata'Guibai 4'are better than those of Zunyi B.striata,Ziyuan B.striata and Ziyuan B.ochracea,and therefore can be selected as quality variety for growers.