| qLeymus chinensis, also called Tzvel, is a very important perennial, rhizomatous grass that distributes in the north grasslands of China. It has high forage value and good palatability, the cold extremes, drought conditions and saline-alkali characteristics tolerant, in addition, it is widely used for making the grass ideal rangeland in arid and semiarid regions, and also is one of the most important ecological grasses of China. However, the sexual reproductive capability of L. chinensis is weak, and seed yield is low, severely restricts the improvement of natural grassland and stand establishment for herb's production. This experiment was to study the change of the daughter shoot of L. chinensis population, including birth time, number, development, and their next year, with the spike formation traits corresponding relationship of character. The results showed that:(1) The rush birth time of daughter apical rhizome shoot, daughter axillary rhizome shoot and daughter axillary shoot was all concentrated in September. The vast majority of shoot buds have formed the daughter shoots, and depends on daughter axillary shoot live through the winter; axillary rhizome buds rarely form, most them with underground buds form wintering; daughter apical rhizome shoots in different years indicate difference between the amount of precipitation and the number of overwinter apical rhizome bud.(2) From the type of the daughter shoot, daughter axillary shoot always maintains absolute advantage in number as the subject of three types daughter shoot; From development of daughter shoot, there were daughter shoots of 1 ~ 5 leaf age, but most daughter shoots were 2 and 3 leaf age. Daughter shoots of absolute number 2, 3 leaf age, and daughter axillary shoot with tiller number of principal role.(3) At the end of growing season, three types of daughter shoots in the same birth time, and same level of leaf age, the development of plant height and leaf age were not obviously different; but different level of leaf age, there will be obvious differences in higher levels of leaf age, the greater the development of plant height and leaf age. Meanwhile, three types of daughter shoots whether 1, 2 or 3 leaf age, the development of leaf age and plant height will with the birth time over backwards became smaller.(4) At the end of growing season, the birth rate of leaf age and plant height of daughter apical rhizome shoot slightly higher than the daughter axillary shoot and daughter axillary rhizome shoot, but it was not obvious expressions. Among the different leaf age of daughter shoots, the smaller leaf age of daughter shoots, the larger birth rate of leaf age and plant height. On the contrary, the larger leaf age of daughter shoots, the smaller birth rate of leaf age and plant height. Meanwhile, whether 1, 2 or 3 leaf age of the three types of daughter shoots, the maximum birth rate of the leaf age and plant height all appeared in earlier birth time, and gradually smaller with the birth time.(5) The earlier of starting birth time of L. chinensis daughter shoot (means that developmental time was longer to the end of growing season), the better of the development, such as the leaf age and plant height were larger. Meanwhile, the larger of leaf age and plant height, the longer spike time and the higher spike rate were appeared next year, five indicators of the spike formation were also better.(6) Fewer daughter shoots birthed on 1th of August, while most of them could spike next year, spike rate was highest and they were also had largest contributions to spike formation. Among all of spike of daughter shoots, daughter axillary shoot had largest contributions for spike formation from the type of the daughter shoots, and daughter shoots of 3 or 4 leaf age had largest contributions for spike formation from the leaf age. |
