Efficient in vitro Propagation of an Endangered Species Kolkwitzia amabilis Graebn

This study developed an efficient in vitro cultivation and propagation sys- tem for an endangered species Kolkwitzia amabilis using nodal segments as ex- plants. Multiple shoots were induced through axillary bud formation. The highest fre- quency of multiple shoot induction was achieved when the nodal segment explants were incubated in Murashige and Skoog （MS） medium supplemented with 4.44 pM 6-benzyladenine （6-BA） in combination with 0.54 μM a-naphthaleneacetic acid （NAA）, followed by treatment with 4.44 μM 6-BA in combination with 0.27 μM NAA. Shoot multiplication could be induced in MS medium supplemented with stand-alone 6-BA or 6-BA in combination with indole-3-acetic acid （1.71 μM） or NAA （0.27 or 0.54 μM）, with 6-BA and either compound, exhibiting a stronger effect on shoot multiplication. The optimum combination of plant growth regulators for shoot multiplication was 4.44 μM 6-BA with 0.27 μM NAA. The maximum rooting percentage was obtained in a half-strength MS medium supplemented with indole-3-butyric acid alone and in com- bination with NAA and 2,4-dichlorophenoxyacetic acid, but the best combination of plant growth regulators for rooting was 1.48 μM indole-3-butyric acid with 1.08 μM NAA and 0.05 μM 2,4-dichlorophenoxyacetic acid. The rooted shoots were trans- ferred to a greenhouse with a success rate of 100%.

新型生化制剂维他灵在小麦生长后期应用效果研究

由江苏省淮阴市农科所飞龙公司和省农林厅花卉贸易中心联合研制的维他灵系列产品，是建立在一种新的理论基础上的新型植物生长调节剂，研究表明，小麦后期喷施维他灵（一号为麦类专用）可显著提高对不良环境的抗性，特别是抗干热风及中后期干旱，提高光合强度，减少小花退化，促进灌浆，保证“源，库，流”的平衡提高，一般增产１０％以上，旱年可达２０％。