长期贮藏对马尾松种子品质的影响

Effect of Long-term Storage on Seed Quality of Masson Pine

利用３个气候带５个产地的马尾松（ＰｉｎｕｓｍａｓｓｏｎｉａｎａＬａｍｂ）种子，采取２种贮藏方法贮藏，在采种后１１ａ里对贮藏种子逐年进行品质测定。常温开放贮藏法，种子贮藏３～４ａ发芽率降到２％～０％，几乎丧失生活力；而２～４℃低温密封贮藏法，可使北亚热带种子贮藏８ａ，中亚热带种子１０ａ以上，南亚热带种子３～４ａ，此时，种子发芽率仍能保持在贮藏前发芽率的７０％。可供生产上继续使用。贮藏种子必须是发育正常、完全成熟的种子，为此应在最适采种期采种。），相关极紧密（详见图２）。２．３．３ 发霉率 ５个产地的种子发霉率在贮藏期间均以二次抛物型曲线增高（图３）。河南桐柏，浙江淳安和永康产地的发霉率随贮藏年限的增长缓慢增高，三者的变化趋势较一致。而浙江仙居和广西宁明种子在贮藏期间发霉率则迅速增高，两者的变化趋势也较一致。不同产地种子贮藏前及贮藏第６年以前均无空粒，第７年至第１１年空粒逐渐增多，其年增长率是中、北亚热带为１％～６％，南亚热带为１％～２０％。２．３．４呼吸强度为了进一步说明不同产地种子的生活力，将贮藏第４年的种子进行呼吸强度测定。贮藏在低温密封条件下的种子呼吸强度：中亚热带１００粒种子每小时ＣＯ２释放量为４．４?

The seeds of masson pine from five seed sources within three climate zoneswere stored in two ways.The quality of the stored seeds was measured year by year in 11years after seed collection.The results showed that,using the method of open storage in theair,the germination rate of the seeds was reduced to 2%～0%after 3～4 years and the vital-ity were forfeited entirely,while using closed storage method under low temperature of 2～4℃,the seeds from northern subtropical zone could be stored for 8 years,middle subtropicalzone over 10 years,and southern subtropical zone 3～4 years,when their germination ratewere still over 70% of the originai germination rate,and the stored seeds could still be usedin production.The stored seeds must be developed normally and ripen completely,and soshould be collected in optimum seed-collecting time.