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Effects of daughter tiller removal on shoot and root growth of the parent tiller in Lolium perenne

Grassland Research 2022年第2期1卷 103-110页

作者： Arif Hasan Khan Robin Cory Matthew The School of Agriculture and Environment College of SciencesMassey UniversityPalmerston NorthNew Zealand Department of Genetics and Plant Breeding Bangladesh Agricultural UniversityMymensinghBangladesh

Background:This study investigated the effects of daughter tiller removal on parent tiller development in Lolium ***:Plants of *** were grown hydroponically to allow separation of roots by phytomer position on the tiller axis and allowed to form two daughter *** Experiment 1,adult daughter tillers were excised and effects on subsequent main tiller growth were observed for 16 days,on *** Experiment 2,the growth of main tillers with or without daughter tillers was compared over 90–100 *** cultivars,‘Alto’bred from New Zealand germplasm and‘Aberdart’bred from United Kingdom germplasm were ***:Excision of adult daughter tillers reduced the dry weight of older roots at the base of parent tiller axes and accelerated new phytomer *** tillers from forming daughter tillers by new tiller excision resulted in increased individual leaf and root dry weight in tillers without daughter ***:The data indicated that daughter tillers contributed substrate for root development of their parent *** presence of daughter tillers reduced the size of their main tiller but greatly enhanced whole plant yield.

关键词： daughter tiller dry weight main tiller perennial ryegrass phytomer

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Forage Production and Selection for Vigor in Meadow and Hybrid Bromegrass in the Northern Great Plains

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American Journal of Plant Sciences 2020年第1期11卷 91-110页

作者： R. Martine Similien Arvid Boe Bruce Coulman Plant Sciences Department South Dakota State University Brookings SD USA Plant Science Department University of Saskatchewan Saskatoon Canada

Meadow bromegrass (Bromus riparius Rehmann) is an important forage crop in Canada and the Intermountain West, but it has not been extensively evaluated in the northern Great Plains (NGP). Our objectives were to 1) evaluate meadow, smooth, and hybrid bromegrasses for forage production under intensive management in eastern South Dakota, and 2) evaluate the effect of selection for vigor in multiple environments on forage production of meadow bromegrass. Thirteen populations (7 meadow bromegrass, 5 hybrid bromegrass, and 1 smooth bromegrass) were evaluated for 4 yrs (2005-2007, 2009) at Brookings, SD. Biomass at anthesis was greater for smooth (6.75 Mg ha-1) than for meadow or hybrid brome (5.4 Mg ha-1) in 2005, but production at anthesis during 2006 and 2007 was similar for meadow and smooth bromegrass. Regrowth harvested during July and October 2005 and November 2006 was greater for meadow than smooth or hybrid bromegrass. Forage production at anthesis in 2009, after rest (i.e., no cutting) and fertilization in 2008, was 4.2 Mg ha-1 for meadow bromegrass compared with 3.3 Mg ha-1 and 2.6 Mg ha-1 for hybrid and smooth bromegrass, respectively. Smooth and hybrid bromegrasses had more leaves·tiller-1 than meadow bromegrass. After 6 yrs, meadow bromegrass had higher tiller density and greater potential for tolerating multiple harvests during a growing season than did smooth or hybrid bromegrass. Selection for vigor in multiple environments in North America resulted in experimental populations of meadow bromegrass with superior forage yield compared with ‘Fleet’ on marginal crop land in the northern Great Plains.

关键词： Bromus riparius Smooth Bromegrass Bromus inermis Morphology phytomer Biomass Partitioning Leaf Ratio Tiller Density Marginal Cropland

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