Effects of different culture methods on the yield and growth of peanut sprouts

Peanut sprout is a kind of high-quality sprout. In order to screen suitable peanut lines and treatment methods for peanut sprout production，water culture method，sand culture method and auxin treatment method were used to treat five peanut lines. The fresh weight ，hypocotyl length，hypocotyl thickness and radicle length were measured. The results showed that the weight gain coefficient of sand culture treatment and auxin treatment were 4.21 ±（0.49） and 4.20（±0.48），which were significantly higer than water culture treatment 3.52（±0.33）. Under the water culture treatment，the weight gain coefficient of PN01 was the highest（4.44），followed by PN05（4.02）. But under sand culture and auxin treatment，the weight gain coefficient of PN05 line was the highest，respectively 5.27 and 5.50. PN01 was both followed secondly by 5.14. The hypocotyl length，hypocotyl thickness and radicle length of auxin-treated peanut sprouts are 4.41（ ±0.28）cm，6.74（ ±0.13）mm and 1.60（ ±0.11）cm. Comparing with water culture treatment，the differences were extremely significant. Auxin treatment can promote the radicle length and thickness significantly and inhibit the endoderm growth. The hypocotyl length，hypocotyl thickness and radicle length of peanut sprouts in sand culture method were 4.83（±0.28）cm、6.00（±0.20）mm and 5.51（±0.43） cm. The hypocotyl length and radicle length were signficiantly better than water culture method，but the hypocotyl thickness was not dramatically. It can be seen that auxin regulation can increase the yield and quality of peanut sprouts by promoting the growth of the length and thickness of the hypocotyl but concurrently inhibiting the elongation of the radicle length. The sand culture method can promote the elongation of the hypocotyl length and increase the peanut sprouts yield but also can promote the elongation of radicle length and reduce the commerciality of peanut sprouts. PN01 and PN05 are suitable lines for the production of peanut sprouts. PN05 is especially suitable for the sand culture and auxin treatment method，while PN01 line is more suitable for water culture method.