| The Nansha Islands are high temperature,high humidity,high salt,and lack of soil and fresh water,which poses great threat to plant growth.As a result,vegetable supply shortages are common on the island.In this case,the majority of the islanders on the long-term diet imbalance,micronutrient intake is insufficient,triggering a variety of common chronic diseases,and because of the limited medical conditions on the island,gradually appeared "difficult to see a doctor" problem.Besides,most wild vegetables have the same characteristics of food and medicine,and have certain preventive and therapeutic effects on some common diseases.Therefore,the introduction of wild vegetables into the island,to promote edible,to a certain extent,to alleviate the problem of insufficient supply of vegetables,but also to increase the islanders diet diversity.Due to these factors,five species of wild vegetables-Talinum paniculatum,Piper sarmentosum,Polygonum chinense,Anredera cordifolia,Tetragonia tetragonioides are selected as the subjects for the research,using propagation technique and salt tolerance experimental methods.It hopes that the studies can provide theoretical basis and technical support for cultivating wild vegetables on islands.The results are as follows:Seed propagation of T.paniculatum and T.tetragonioides: After placing the T.paniculatum seeds in water and soaking in 6 hours,the seed germination effect was the best,the germination rate was 83.3%,and the germination potential was 26.67%.T.tetragonioides had a better germination in the coconut brab: river sand(1:1)mixed matrix,28%.Cutting propagation of P.chinense and P.sarmentosum: In the matrix screening test,the most suitable cutting medium of P.chinense was peat soil: river sand(1:3),rooting rate was 78.3%.Meanwhile,the most suitable cutting medium for P.sarmentosum was peat soil: perlite: vermiculite(2:1:1)with a rooting rate of 51.67%.In addition,a four factor and three level orthogonal experiment about different cutting methods,different types and concentration of hormones,and different steeping time was designed to study rooting rate which shown that the root rate of P.chinense was 83.3%,which was the highest,after soaking with the water by oblique inseting.On the other hand,using the same cutting method,P.sarmentosum's cutting was dipped in the IBA 500mg/L in an oblique manner after 10 minutes and the rooting rate was highest,reaching 93.3%.Tuber and bead bud reproduction of A.cordifolia: The vegetative propagation was studied by selecting three different quality ranges of healthy bead buds or tubers as breeding materials.The results showed that the germination rate of tuber was higher than bead bud.Among them,the germination rate of quality range in the 2.5-6.6g tubers was highest,up to 96.67%,and each tuber had an average tiller of two new branches.The salt tolerance of 5 species of wild vegetables was studied by hydroponic method.And the order of salt tolerance ability was preliminarily conclude as follows: T.tetragonioides > T.paniculatum > P.sarmentosum > P.chinense > A.cordifolia.Moreover,T.paniculatum,P.sarmentosum and P.chinense could adapt to the concentration of 10% of seawater.And it had an obvious promoting effect for T.tetragonioides to the treatment of 25% and 50% seawater irrigation. |
PDF Full Text Request