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Growth,leaf anatomy,and photosynthesis of cotton(Gossypium hirsutum L.)seedlings in response to four light-emitting diodes and high pressure sodium lamp

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Journal of Cotton Research 2024年第1期7卷 79-89页

作者： ZHANG Yichi LIAO Baopeng LI Fangjun eneji aegrinya DU Mingwei TIAN Xiaoli Engineering Research Center of Plant Growth Regulator Ministry of EducationCollege of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100193China Department of Soil Science Faculty of AgricultureForestryand Wildlife Resources ManagementUniversity of CalabarCalabarNigeria

Background Light is a critical factor in plant growth and development,particularly in controlled ***-emitting diodes(LEDs)have become a reliable alternative to conventional high pressure sodium(HSP)lamps because they are more efficient and versatile in light *** contrast to well-known specialized LED light spectra for vegetables,the appropriate LED lights for crops such as cotton remain *** In this growth chamber study,we selected and compared four LED lights with varying percentages(26.44%–68.68%)of red light(R,600–700 nm),combined with other lights,for their effects on growth,leaf anatomy,and photosynthesis of cotton seedlings,using HSP lamp as a *** total photosynthetic photon flux density(PPFD)was(215±2)μmol·m-2·s-1 for all LEDs and HSP *** results showed significant differences in all tested parameters among lights,and the percentage of far red(FR,701–780 nm)within the range of 3.03%–11.86%was positively correlated with plant growth(characterized by leaf number and area,plant height,stem diameter,and total biomass),palisade layer thickness,photosynthesis rate(Pn),and stomatal conductance(Gs).The ratio of R/FR(4.445–11.497)negatively influenced the growth of cotton seedlings,and blue light(B)suppressed stem elongation but increased palisade cell length,chlorophyll content,and *** The LED 2 was superior to other LED lights and HSP *** had the highest ratio of FR within the total PPFD(11.86%)and the lowest ratio of R/FR(4.445).LED 2 may therefore be used to replace HPS lamp under controlled environments for the study of cotton at the seedling stage.

关键词： Cotton seedling Light-emitting diodes Biomass Palisade cell Photosynthesis

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Cotton maturity and responses to harvest aids following chemical topping with mepiquat chloride during bloom period

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Journal of Integrative Agriculture 2022年第9期21卷 2577-2587页

作者： QI Hai-kun DU Ming-wei MENG Lu XIE Liu-wei aegrinya eneji XU Dong-yong TIAN Xiao-li LI Zhao-hu Engineering Research Center of Plant Growth Regulator Ministry of Education/College of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100193P.R.China Department of Soil Science Faculty of AgricultureForestry and Wildlife Resources ManagementUniversity of CalabarCalabar 540271Nigeria Hebei Cottonseed Engineering Technology Research Center Hejian 062450P.R.China

Early maturity, complete defoliation and boll opening are essential for the efficient machine harvesting of cotton. Chemical topping, involving one extra application of mepiquat chloride(MC) in addition to its traditional multipleapplication strategy, may be able to replace manual topping. However, it is not known whether this chemical topping technique will influence maturity or cotton responses to harvest aids. In this 2-yr field study, we determined the effects of the timing of chemical topping using various rates of MC on boll opening percentage(BOP) before application of harvest aids(50% thidiazuron··ethephon suspension concentrate, referred to as TE), and the defoliation percentage(DP) and BOP 14 days after TE application. The results indicated that late chemical topping(near the physiological cutout, when the nodes above white flower is equal to 5.0) significantly decreased BOP before TE by 5.9–11.2% compared with early(at peak bloom) or middle(seven days after peak bloom) treatments in 2019, which was a relatively normal year based on crop condition. Also, a high MC rate(270 g ha) showed a significantly lower(22.0%) BOP before TE than low(90 g ha) or medium(180 g ha) rates. In 2020, which was characterized by stronger vegetative growth in the late season, the late chemical topping reduced the number of leaves before TE application relative to early or middle treatments, but had lower DP(23.2–27.2%) 14 days after TE application. The high MC rate showed a leaf count before TE application that was similar to the low and medium rates, but it showed the most leaves after TE and much lower(15.0–21.7%) DP in 2020. These results suggest that late timing of chemical topping and a high MC rate decreased the sensitivity of leaves to harvest aids. Further analysis indicated that the late chemical topping mainly affected the leaf drop from the mainstem and fruiting branches where the late regrowth occurred, and the high MC rate reduced leaf shedding from these parts and

关键词： cotton mepiquat chloride thidiazuron ethephon defoliation maturity

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Introduction of Bacillus thuringiensis(Bt)gene does not reduce potassium use efficiency of Bt transgenic cotton(Gossypium hirsutum L.)

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Journal of Cotton Research 2022年第3期5卷 274-284页

作者： WANG Qianqian YAN Wei ZHANG Yichi ZHAN Manman LUO Xiaoli eneji aegrinya ZHANG Anhong XIAO Juanli LI Fangjun TIAN Xiaoli State Key Laboratory of Plant Physiology and Biochemistry/College of Agronomy and Biotechnology China Agricultural UniversityNo 2 Yuanmingyuan Xi LuHaidian DistrictBeijing 100193China Shanxi Agricultural University/Institute of Cotton Research Shanxi Academy of Agriculture ScienceYuncheng 044000ShanxiChina Department of Soil Science Faculty of AgricultureForestry and Wildlife Resources ManagementUniversity of CalabarCalabarNigeria.

Background:Potassium(K)deficiency has become a common field production problem following the widespread adoption of Bacillus thuringiensis(Bt)transgenic cotton(Gossypium hirsutum L.)*** purpose of this study was to clarify whether the introduction of Bt gene directly reduces the K-use efficiency of cotton to induce K ***:The cotton variety,Jihe 321(wild type,WT)and its two Bt(Cry1Ac)-transgenic overexpression lines(OE-29317,OE-29312)were studied in field with low soil-test K+(47.8 mg·kg^(−1)).In the field with low soil-test K+,only OE-29317 had less biomass and K+accumulation than the WT at some growth *** Bt lines produced similar or even greater seed cotton yield than WT in the *** the Bt gene(~70%)in OE-29317 and OE-29312 plants was silenced by virus-induced gene silencing(VIGS),the VIGS-Bt plants did not produce more biomass than VIGSgreen fluorescent protein(control)***:The introduction of Bt gene did not necessarily hinder the K use efficiency of the cotton lines under this study.

关键词： Biomass Bt(Bacillus thuringiensis)gene Cotton(Gossypium hirsutum L.) K uptake K utilization index Yield

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