CAO Shu2qing 1, ZHA IH u2qu 1, YAN G Tu2nan 2, ZHAN G Rong2xian 1, 3, KUAN G T ing2yun 3

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1 (Ch inese J R ice S ci) (1) : ( ; ; 10009; ) Studies on Pho to syn thetic R ate and Function D u ration of R ice Germ p lasm R esou rces CAO Shu2qing 1 ZHA IH u2qu 1 YAN G Tu2nan 2 ZHAN G Rong2xian 1 KUAN G T ing2yun ( 1 A g ronomy D ep artm ent N anj ing A g ricu ltu ral U niversity N anj ing Ch ina; J iangsu P rov ince China; Institute of B otany Chinese A cademy of S ciences B eij ing China; 2 Z henj iang A g ricultural S cience Institute Z henj iang Corresp ord ing author) Abstract: Two hundred and thirty rice germp lasm resources w ere used to analyse their pho to synthetic rates (P n ) and function duration (RSP). The results show ed that the variation coefficient of P n and RSP of individuals w ithin a rice variety w as 210% % and. 5% % but it w as 11. 1% and 11. 2% among rice varieties respectively. A nalysis of statis2 tics w ith experim ental results show ed that the difference of P n and RSP among rice varieties w as significant at 1% level but no t betw een indica and japonica rice. The num bers of indica rice w ith high P n and japonica rice w ith long RSP w ere relatively mo re. A cco rding to the clustering results 42 rice varieties w ere separated into three group s i. e. high m iddle and low of P n and RSP respectively. into 4 quadrants. Two dim ension compo sito r w as m ade in rice varieties fo r P n and RSP and this coo rdinate w as divided The distribution frequency of indica and japonica rice varieties w as the highest in the second and first quad2 rant respectively. Som e rice varieties regarded as special pho to synthesis resources w ere screened out such as Xieyou 908 L unhui 422 W uyujing 8 N PT Shanyou 129. They m ight be used to op tim ize rice cro ssing and study pho to synthesis heredity imp roving in rice. Key words: pho to synthetic rate; pho to synthetic function duration; germp lasm resource; rice : % 11. 0%. 5% 9. 5% 11. 1% 11. 2% 42 4 g I. 4%. % N PT 129 : ; ; ; : Q 945; S ; S : A : (2001) : ; : : (G ) ; : (1966- )

2 ( ) SPAD % 2 (R elative steady phase of ch lo rophyll content R SP) 7 O hno ; s) Λmo lg(m 2 s) ( 12A ) 20 ( O ry z a sa tiva L. ) 2. 4 Λmo lg(m 2 s) Λmo lg(m 2 s) ( 1) % cm 2. 8% 20 cm 0 1 ( 2) BAU 64. % Λmo lg CO ΛL gl (PFD ) (m 2 s) 2. 6 Λmo lg(m 2 s) 1200 Λmo lg(m 2 s) (2 ) ( 22A ) ( ) 2. 0% 11. 0% : (1) 11. 1% ( 22B ) (2) 8: 0 10: ( 1) ( CO 2 ) 2. 4 Λmo lg(m 2 O hno 4 5 Λmo lg(m 2 s) ( 1) 2. 2 () 5. 7 d d 0. 6

3 : 1 1 Table 1. The values of photosynthetic rate of r ice germplasm resourceṡ Indica rice P ng(λmo l m - 2 s - 1 ) Japonica rice P ng(λmo l m - 2 s - 1 ) Teqing Kinm aze Guichao Zhendao M inghui Suxiejing R eakyeng Baxiludao Taiying N PT Yanhui Yanjing Zhenhui W uyujing R Zhendao Shanyou Zhendao Shanyou Zhenxiangjing Shanyou Chuangui X ieyou Shidao X ieyou W uyujing g 162 g you O u X ieyou g 129 g you Shanyou Hexi Green L unhui Yangdao Zhenxian Shiyou IR C A verage of indica rice A verage of japonica rice A verage P n- Pho to synthetic rate. 2 Table 2. Var iance of leaf photosynthetic rate and active photosynthesis function duration among r ice var ietieṡ Item P n R SP RSP - Source of variance S S d f M S F F value Among varieties W ithin a variety To tal Among varieties Pho to synthetic function duration. W ithin a variety To tal ( 12B ) 4. 9 d 61 d d d d t 4. 0 d ( 22C). 5% 19. 0% 915% 11. 2% ( % D ) 517 d 2 2.

4 ( ) ( 4) 42 : Λmo lg(m 2 s) 19105% ; Λmo lg(m 2 s) % ; 21. Λmo lg(m 2 s) 21. 4% 9. 6 d % ; d % ; 2. 8 d % ( ) 4 ( ) I: ; g : ; g : ; g : 1 F ig. 1. D istribution frequency of P n and RSP in rice germp lasm g g 5214% resources. 4218% g g Table. The values of photosynthetic function duration of r ice germplasm resourceṡ Indica rice R SPgd Japonica rice Teqing Kinm aze Guichao Zhendao M inghui Suxiejing R eakyeng Baxiludao Taiying N PT Yanhui Yanjing Zhenhui W uyujing R Zhendao Shanyou Zhendao Shanyou Zhenxiangjing Shanyou Chuangui X ieyou Shidao X ieyou W uyujing g 162 g you O u X ieyou R SPgd g 129 g you Shanyou Hexi Green L unhui Yandao Zhenxian Shiyou IR C A verage of indica rice A verage of japonica rice A verage

5 : 4 Table 4. Classif ication on Pn and RSP in r ice germplasm resourceṡ P ng(λmo l m - 2 s - 1 ) ; R SPgd Pho to synthetic N um ber of D istribution Type trait varieties frequencyg% A verage w ithin group R ange P n H igh M iddle Low R SP Long M iddle Sho rt % 6119% N PT F ig.. Two dim ension compo sito r of P n and RSP in rice germp lasm resources ; 2-6; - ; 4-8 ; 5- g 129; 6-422; 7- N PT; Xieyou 908; 2 - Shanyou 6; - W uyujing ; 4 - F ig. 2. D istribution frequency on standard difference and CV of P n and RSP in rice germp lasm resources. W uyujing 8; Shanyou g you 129; 6 - L unhui 422; 7 - N PT; 8 -

6 ( ) 6 : ( 1. [J (6) : 1 6 ) 2. 2 [J (1) : 5 9. [J. g 4 O hno. g 12 80% M o ss 10 Good 11 Giffo rd 12 N elson 1 Evans 14 6 g g % 15% ( ) 6 g g I ( ) (2) : V arietal differences of pho to synthetic efficiency and dry m atter p roduction in indica rice [J. T ro A g ri : [J (2) : [M. : 7. [J : [J () : [M. : M o ss D N. Studies on increasing pho to synthesis in crop p lants [A. In: Burris R H B lack C C. CO 2M etabo lism and P lant P ro2 ductivity[m. Baltimo re: U niversity Park P ress Good N E Bell D H. Pho to synthesis p lant p roductivity and crop yield[a. In: Caarlson P S. The B io logy of C rop P roductivi2 ty[m. N ew Yo rk: A cadem ic P ress Giffo rd R M. Barries to increasing crop p roductivity by genetic imp rovem ent in pho to synthesis [A. In: B iggins J. P rogress in Pho to synthesis Research Vo l. g [C. Do rdrecht: M artinus N i2 jhoff Publishers N elson C J A say K H Ho rst G L et al. Genetic association be2 tw een pho to synthetic characteristics and yield: review of the evi2 dence[j. P lant P hy siol B iochem : Evans L T. F rom leaf pho to synthesis to crop p roductivity [A. In: M urata N. Research in Pho to synthesis Vo l. g [M. Do r2 drecht: Kluw er A cadem ic Publishers [C. : (1) [C. :